Got basic webpage working. Need to make base page, static folders

flex/lib/python3.6/site-packages/django/utils/_os.py

@@ -0,0 +1,68 @@
+import os
+import tempfile
+from os.path import abspath, dirname, join, normcase, sep
+
+from django.core.exceptions import SuspiciousFileOperation
+from django.utils.encoding import force_text
+
+# For backwards-compatibility in Django 2.0
+abspathu = abspath
+
+
+def upath(path):
+    """Always return a unicode path (did something for Python 2)."""
+    return path
+
+
+def npath(path):
+    """
+    Always return a native path, that is unicode on Python 3 and bytestring on
+    Python 2. Noop for Python 3.
+    """
+    return path
+
+
+def safe_join(base, *paths):
+    """
+    Join one or more path components to the base path component intelligently.
+    Return a normalized, absolute version of the final path.
+
+    Raise ValueError if the final path isn't located inside of the base path
+    component.
+    """
+    base = force_text(base)
+    paths = [force_text(p) for p in paths]
+    final_path = abspath(join(base, *paths))
+    base_path = abspath(base)
+    # Ensure final_path starts with base_path (using normcase to ensure we
+    # don't false-negative on case insensitive operating systems like Windows),
+    # further, one of the following conditions must be true:
+    #  a) The next character is the path separator (to prevent conditions like
+    #     safe_join("/dir", "/../d"))
+    #  b) The final path must be the same as the base path.
+    #  c) The base path must be the most root path (meaning either "/" or "C:\\")
+    if (not normcase(final_path).startswith(normcase(base_path + sep)) and
+            normcase(final_path) != normcase(base_path) and
+            dirname(normcase(base_path)) != normcase(base_path)):
+        raise SuspiciousFileOperation(
+            'The joined path ({}) is located outside of the base path '
+            'component ({})'.format(final_path, base_path))
+    return final_path
+
+
+def symlinks_supported():
+    """
+    Return whether or not creating symlinks are supported in the host platform
+    and/or if they are allowed to be created (e.g. on Windows it requires admin
+    permissions).
+    """
+    with tempfile.TemporaryDirectory() as temp_dir:
+        original_path = os.path.join(temp_dir, 'original')
+        symlink_path = os.path.join(temp_dir, 'symlink')
+        os.makedirs(original_path)
+        try:
+            os.symlink(original_path, symlink_path)
+            supported = True
+        except (OSError, NotImplementedError):
+            supported = False
+        return supported

flex/lib/python3.6/site-packages/django/utils/archive.py

@@ -0,0 +1,227 @@
+"""
+Based on "python-archive" -- http://pypi.python.org/pypi/python-archive/
+
+Copyright (c) 2010 Gary Wilson Jr. <[email protected]> and contributors.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+import os
+import shutil
+import stat
+import tarfile
+import zipfile
+
+
+class ArchiveException(Exception):
+    """
+    Base exception class for all archive errors.
+    """
+
+
+class UnrecognizedArchiveFormat(ArchiveException):
+    """
+    Error raised when passed file is not a recognized archive format.
+    """
+
+
+def extract(path, to_path=''):
+    """
+    Unpack the tar or zip file at the specified path to the directory
+    specified by to_path.
+    """
+    with Archive(path) as archive:
+        archive.extract(to_path)
+
+
+class Archive:
+    """
+    The external API class that encapsulates an archive implementation.
+    """
+    def __init__(self, file):
+        self._archive = self._archive_cls(file)(file)
+
+    @staticmethod
+    def _archive_cls(file):
+        cls = None
+        if isinstance(file, str):
+            filename = file
+        else:
+            try:
+                filename = file.name
+            except AttributeError:
+                raise UnrecognizedArchiveFormat(
+                    "File object not a recognized archive format.")
+        base, tail_ext = os.path.splitext(filename.lower())
+        cls = extension_map.get(tail_ext)
+        if not cls:
+            base, ext = os.path.splitext(base)
+            cls = extension_map.get(ext)
+        if not cls:
+            raise UnrecognizedArchiveFormat(
+                "Path not a recognized archive format: %s" % filename)
+        return cls
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.close()
+
+    def extract(self, to_path=''):
+        self._archive.extract(to_path)
+
+    def list(self):
+        self._archive.list()
+
+    def close(self):
+        self._archive.close()
+
+
+class BaseArchive:
+    """
+    Base Archive class.  Implementations should inherit this class.
+    """
+    @staticmethod
+    def _copy_permissions(mode, filename):
+        """
+        If the file in the archive has some permissions (this assumes a file
+        won't be writable/executable without being readable), apply those
+        permissions to the unarchived file.
+        """
+        if mode & stat.S_IROTH:
+            os.chmod(filename, mode)
+
+    def split_leading_dir(self, path):
+        path = str(path)
+        path = path.lstrip('/').lstrip('\\')
+        if '/' in path and (('\\' in path and path.find('/') < path.find('\\')) or '\\' not in path):
+            return path.split('/', 1)
+        elif '\\' in path:
+            return path.split('\\', 1)
+        else:
+            return path, ''
+
+    def has_leading_dir(self, paths):
+        """
+        Return True if all the paths have the same leading path name
+        (i.e., everything is in one subdirectory in an archive).
+        """
+        common_prefix = None
+        for path in paths:
+            prefix, rest = self.split_leading_dir(path)
+            if not prefix:
+                return False
+            elif common_prefix is None:
+                common_prefix = prefix
+            elif prefix != common_prefix:
+                return False
+        return True
+
+    def extract(self):
+        raise NotImplementedError('subclasses of BaseArchive must provide an extract() method')
+
+    def list(self):
+        raise NotImplementedError('subclasses of BaseArchive must provide a list() method')
+
+
+class TarArchive(BaseArchive):
+
+    def __init__(self, file):
+        self._archive = tarfile.open(file)
+
+    def list(self, *args, **kwargs):
+        self._archive.list(*args, **kwargs)
+
+    def extract(self, to_path):
+        members = self._archive.getmembers()
+        leading = self.has_leading_dir(x.name for x in members)
+        for member in members:
+            name = member.name
+            if leading:
+                name = self.split_leading_dir(name)[1]
+            filename = os.path.join(to_path, name)
+            if member.isdir():
+                if filename and not os.path.exists(filename):
+                    os.makedirs(filename)
+            else:
+                try:
+                    extracted = self._archive.extractfile(member)
+                except (KeyError, AttributeError) as exc:
+                    # Some corrupt tar files seem to produce this
+                    # (specifically bad symlinks)
+                    print("In the tar file %s the member %s is invalid: %s" %
+                          (name, member.name, exc))
+                else:
+                    dirname = os.path.dirname(filename)
+                    if dirname and not os.path.exists(dirname):
+                        os.makedirs(dirname)
+                    with open(filename, 'wb') as outfile:
+                        shutil.copyfileobj(extracted, outfile)
+                        self._copy_permissions(member.mode, filename)
+                finally:
+                    if extracted:
+                        extracted.close()
+
+    def close(self):
+        self._archive.close()
+
+
+class ZipArchive(BaseArchive):
+
+    def __init__(self, file):
+        self._archive = zipfile.ZipFile(file)
+
+    def list(self, *args, **kwargs):
+        self._archive.printdir(*args, **kwargs)
+
+    def extract(self, to_path):
+        namelist = self._archive.namelist()
+        leading = self.has_leading_dir(namelist)
+        for name in namelist:
+            data = self._archive.read(name)
+            info = self._archive.getinfo(name)
+            if leading:
+                name = self.split_leading_dir(name)[1]
+            filename = os.path.join(to_path, name)
+            dirname = os.path.dirname(filename)
+            if dirname and not os.path.exists(dirname):
+                os.makedirs(dirname)
+            if filename.endswith(('/', '\\')):
+                # A directory
+                if not os.path.exists(filename):
+                    os.makedirs(filename)
+            else:
+                with open(filename, 'wb') as outfile:
+                    outfile.write(data)
+                # Convert ZipInfo.external_attr to mode
+                mode = info.external_attr >> 16
+                self._copy_permissions(mode, filename)
+
+    def close(self):
+        self._archive.close()
+
+
+extension_map = {
+    '.tar': TarArchive,
+    '.tar.bz2': TarArchive,
+    '.tar.gz': TarArchive,
+    '.tgz': TarArchive,
+    '.tz2': TarArchive,
+    '.zip': ZipArchive,
+}

flex/lib/python3.6/site-packages/django/utils/autoreload.py

@@ -0,0 +1,317 @@
+# Autoreloading launcher.
+# Borrowed from Peter Hunt and the CherryPy project (http://www.cherrypy.org).
+# Some taken from Ian Bicking's Paste (http://pythonpaste.org/).
+#
+# Portions copyright (c) 2004, CherryPy Team ([email protected])
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+#     * Redistributions of source code must retain the above copyright notice,
+#       this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright notice,
+#       this list of conditions and the following disclaimer in the documentation
+#       and/or other materials provided with the distribution.
+#     * Neither the name of the CherryPy Team nor the names of its contributors
+#       may be used to endorse or promote products derived from this software
+#       without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import os
+import signal
+import subprocess
+import sys
+import time
+import traceback
+
+import _thread
+
+from django.apps import apps
+from django.conf import settings
+from django.core.signals import request_finished
+
+# This import does nothing, but it's necessary to avoid some race conditions
+# in the threading module. See http://code.djangoproject.com/ticket/2330 .
+try:
+    import threading  # NOQA
+except ImportError:
+    pass
+
+try:
+    import termios
+except ImportError:
+    termios = None
+
+USE_INOTIFY = False
+try:
+    # Test whether inotify is enabled and likely to work
+    import pyinotify
+
+    fd = pyinotify.INotifyWrapper.create().inotify_init()
+    if fd >= 0:
+        USE_INOTIFY = True
+        os.close(fd)
+except ImportError:
+    pass
+
+RUN_RELOADER = True
+
+FILE_MODIFIED = 1
+I18N_MODIFIED = 2
+
+_mtimes = {}
+_win = (sys.platform == "win32")
+
+_exception = None
+_error_files = []
+_cached_modules = set()
+_cached_filenames = []
+
+
+def gen_filenames(only_new=False):
+    """
+    Return a list of filenames referenced in sys.modules and translation files.
+    """
+    # N.B. ``list(...)`` is needed, because this runs in parallel with
+    # application code which might be mutating ``sys.modules``, and this will
+    # fail with RuntimeError: cannot mutate dictionary while iterating
+    global _cached_modules, _cached_filenames
+    module_values = set(sys.modules.values())
+    _cached_filenames = clean_files(_cached_filenames)
+    if _cached_modules == module_values:
+        # No changes in module list, short-circuit the function
+        if only_new:
+            return []
+        else:
+            return _cached_filenames + clean_files(_error_files)
+
+    new_modules = module_values - _cached_modules
+    new_filenames = clean_files(
+        [filename.__file__ for filename in new_modules
+         if hasattr(filename, '__file__')])
+
+    if not _cached_filenames and settings.USE_I18N:
+        # Add the names of the .mo files that can be generated
+        # by compilemessages management command to the list of files watched.
+        basedirs = [os.path.join(os.path.dirname(os.path.dirname(__file__)),
+                                 'conf', 'locale'),
+                    'locale']
+        for app_config in reversed(list(apps.get_app_configs())):
+            basedirs.append(os.path.join(app_config.path, 'locale'))
+        basedirs.extend(settings.LOCALE_PATHS)
+        basedirs = [os.path.abspath(basedir) for basedir in basedirs
+                    if os.path.isdir(basedir)]
+        for basedir in basedirs:
+            for dirpath, dirnames, locale_filenames in os.walk(basedir):
+                for filename in locale_filenames:
+                    if filename.endswith('.mo'):
+                        new_filenames.append(os.path.join(dirpath, filename))
+
+    _cached_modules = _cached_modules.union(new_modules)
+    _cached_filenames += new_filenames
+    if only_new:
+        return new_filenames + clean_files(_error_files)
+    else:
+        return _cached_filenames + clean_files(_error_files)
+
+
+def clean_files(filelist):
+    filenames = []
+    for filename in filelist:
+        if not filename:
+            continue
+        if filename.endswith(".pyc") or filename.endswith(".pyo"):
+            filename = filename[:-1]
+        if filename.endswith("$py.class"):
+            filename = filename[:-9] + ".py"
+        if os.path.exists(filename):
+            filenames.append(filename)
+    return filenames
+
+
+def reset_translations():
+    import gettext
+    from django.utils.translation import trans_real
+    gettext._translations = {}
+    trans_real._translations = {}
+    trans_real._default = None
+    trans_real._active = threading.local()
+
+
+def inotify_code_changed():
+    """
+    Check for changed code using inotify. After being called
+    it blocks until a change event has been fired.
+    """
+    class EventHandler(pyinotify.ProcessEvent):
+        modified_code = None
+
+        def process_default(self, event):
+            if event.path.endswith('.mo'):
+                EventHandler.modified_code = I18N_MODIFIED
+            else:
+                EventHandler.modified_code = FILE_MODIFIED
+
+    wm = pyinotify.WatchManager()
+    notifier = pyinotify.Notifier(wm, EventHandler())
+
+    def update_watch(sender=None, **kwargs):
+        if sender and getattr(sender, 'handles_files', False):
+            # No need to update watches when request serves files.
+            # (sender is supposed to be a django.core.handlers.BaseHandler subclass)
+            return
+        mask = (
+            pyinotify.IN_MODIFY |
+            pyinotify.IN_DELETE |
+            pyinotify.IN_ATTRIB |
+            pyinotify.IN_MOVED_FROM |
+            pyinotify.IN_MOVED_TO |
+            pyinotify.IN_CREATE |
+            pyinotify.IN_DELETE_SELF |
+            pyinotify.IN_MOVE_SELF
+        )
+        for path in gen_filenames(only_new=True):
+            wm.add_watch(path, mask)
+
+    # New modules may get imported when a request is processed.
+    request_finished.connect(update_watch)
+
+    # Block until an event happens.
+    update_watch()
+    notifier.check_events(timeout=None)
+    notifier.read_events()
+    notifier.process_events()
+    notifier.stop()
+
+    # If we are here the code must have changed.
+    return EventHandler.modified_code
+
+
+def code_changed():
+    global _mtimes, _win
+    for filename in gen_filenames():
+        stat = os.stat(filename)
+        mtime = stat.st_mtime
+        if _win:
+            mtime -= stat.st_ctime
+        if filename not in _mtimes:
+            _mtimes[filename] = mtime
+            continue
+        if mtime != _mtimes[filename]:
+            _mtimes = {}
+            try:
+                del _error_files[_error_files.index(filename)]
+            except ValueError:
+                pass
+            return I18N_MODIFIED if filename.endswith('.mo') else FILE_MODIFIED
+    return False
+
+
+def check_errors(fn):
+    def wrapper(*args, **kwargs):
+        global _exception
+        try:
+            fn(*args, **kwargs)
+        except Exception:
+            _exception = sys.exc_info()
+
+            et, ev, tb = _exception
+
+            if getattr(ev, 'filename', None) is None:
+                # get the filename from the last item in the stack
+                filename = traceback.extract_tb(tb)[-1][0]
+            else:
+                filename = ev.filename
+
+            if filename not in _error_files:
+                _error_files.append(filename)
+
+            raise
+
+    return wrapper
+
+
+def raise_last_exception():
+    global _exception
+    if _exception is not None:
+        raise _exception[1]
+
+
+def ensure_echo_on():
+    if termios:
+        fd = sys.stdin
+        if fd.isatty():
+            attr_list = termios.tcgetattr(fd)
+            if not attr_list[3] & termios.ECHO:
+                attr_list[3] |= termios.ECHO
+                if hasattr(signal, 'SIGTTOU'):
+                    old_handler = signal.signal(signal.SIGTTOU, signal.SIG_IGN)
+                else:
+                    old_handler = None
+                termios.tcsetattr(fd, termios.TCSANOW, attr_list)
+                if old_handler is not None:
+                    signal.signal(signal.SIGTTOU, old_handler)
+
+
+def reloader_thread():
+    ensure_echo_on()
+    if USE_INOTIFY:
+        fn = inotify_code_changed
+    else:
+        fn = code_changed
+    while RUN_RELOADER:
+        change = fn()
+        if change == FILE_MODIFIED:
+            sys.exit(3)  # force reload
+        elif change == I18N_MODIFIED:
+            reset_translations()
+        time.sleep(1)
+
+
+def restart_with_reloader():
+    while True:
+        args = [sys.executable] + ['-W%s' % o for o in sys.warnoptions] + sys.argv
+        new_environ = os.environ.copy()
+        new_environ["RUN_MAIN"] = 'true'
+        exit_code = subprocess.call(args, env=new_environ)
+        if exit_code != 3:
+            return exit_code
+
+
+def python_reloader(main_func, args, kwargs):
+    if os.environ.get("RUN_MAIN") == "true":
+        _thread.start_new_thread(main_func, args, kwargs)
+        try:
+            reloader_thread()
+        except KeyboardInterrupt:
+            pass
+    else:
+        try:
+            exit_code = restart_with_reloader()
+            if exit_code < 0:
+                os.kill(os.getpid(), -exit_code)
+            else:
+                sys.exit(exit_code)
+        except KeyboardInterrupt:
+            pass
+
+
+def main(main_func, args=None, kwargs=None):
+    if args is None:
+        args = ()
+    if kwargs is None:
+        kwargs = {}
+
+    wrapped_main_func = check_errors(main_func)
+    python_reloader(wrapped_main_func, args, kwargs)

flex/lib/python3.6/site-packages/django/utils/baseconv.py

@@ -0,0 +1,101 @@
+# Copyright (c) 2010 Guilherme Gondim. All rights reserved.
+# Copyright (c) 2009 Simon Willison. All rights reserved.
+# Copyright (c) 2002 Drew Perttula. All rights reserved.
+#
+# License:
+#   Python Software Foundation License version 2
+#
+# See the file "LICENSE" for terms & conditions for usage, and a DISCLAIMER OF
+# ALL WARRANTIES.
+#
+# This Baseconv distribution contains no GNU General Public Licensed (GPLed)
+# code so it may be used in proprietary projects just like prior ``baseconv``
+# distributions.
+#
+# All trademarks referenced herein are property of their respective holders.
+#
+
+"""
+Convert numbers from base 10 integers to base X strings and back again.
+
+Sample usage::
+
+  >>> base20 = BaseConverter('0123456789abcdefghij')
+  >>> base20.encode(1234)
+  '31e'
+  >>> base20.decode('31e')
+  1234
+  >>> base20.encode(-1234)
+  '-31e'
+  >>> base20.decode('-31e')
+  -1234
+  >>> base11 = BaseConverter('0123456789-', sign='$')
+  >>> base11.encode('$1234')
+  '$-22'
+  >>> base11.decode('$-22')
+  '$1234'
+
+"""
+
+BASE2_ALPHABET = '01'
+BASE16_ALPHABET = '0123456789ABCDEF'
+BASE56_ALPHABET = '23456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz'
+BASE36_ALPHABET = '0123456789abcdefghijklmnopqrstuvwxyz'
+BASE62_ALPHABET = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
+BASE64_ALPHABET = BASE62_ALPHABET + '-_'
+
+
+class BaseConverter:
+    decimal_digits = '0123456789'
+
+    def __init__(self, digits, sign='-'):
+        self.sign = sign
+        self.digits = digits
+        if sign in self.digits:
+            raise ValueError('Sign character found in converter base digits.')
+
+    def __repr__(self):
+        return "<%s: base%s (%s)>" % (self.__class__.__name__, len(self.digits), self.digits)
+
+    def encode(self, i):
+        neg, value = self.convert(i, self.decimal_digits, self.digits, '-')
+        if neg:
+            return self.sign + value
+        return value
+
+    def decode(self, s):
+        neg, value = self.convert(s, self.digits, self.decimal_digits, self.sign)
+        if neg:
+            value = '-' + value
+        return int(value)
+
+    def convert(self, number, from_digits, to_digits, sign):
+        if str(number)[0] == sign:
+            number = str(number)[1:]
+            neg = 1
+        else:
+            neg = 0
+
+        # make an integer out of the number
+        x = 0
+        for digit in str(number):
+            x = x * len(from_digits) + from_digits.index(digit)
+
+        # create the result in base 'len(to_digits)'
+        if x == 0:
+            res = to_digits[0]
+        else:
+            res = ''
+            while x > 0:
+                digit = x % len(to_digits)
+                res = to_digits[digit] + res
+                x = int(x // len(to_digits))
+        return neg, res
+
+
+base2 = BaseConverter(BASE2_ALPHABET)
+base16 = BaseConverter(BASE16_ALPHABET)
+base36 = BaseConverter(BASE36_ALPHABET)
+base56 = BaseConverter(BASE56_ALPHABET)
+base62 = BaseConverter(BASE62_ALPHABET)
+base64 = BaseConverter(BASE64_ALPHABET, sign='$')

flex/lib/python3.6/site-packages/django/utils/cache.py

@@ -0,0 +1,413 @@
+"""
+This module contains helper functions for controlling caching. It does so by
+managing the "Vary" header of responses. It includes functions to patch the
+header of response objects directly and decorators that change functions to do
+that header-patching themselves.
+
+For information on the Vary header, see:
+
+    https://tools.ietf.org/html/rfc7231#section-7.1.4
+
+Essentially, the "Vary" HTTP header defines which headers a cache should take
+into account when building its cache key. Requests with the same path but
+different header content for headers named in "Vary" need to get different
+cache keys to prevent delivery of wrong content.
+
+An example: i18n middleware would need to distinguish caches by the
+"Accept-language" header.
+"""
+import hashlib
+import logging
+import re
+import time
+import warnings
+
+from django.conf import settings
+from django.core.cache import caches
+from django.http import HttpResponse, HttpResponseNotModified
+from django.utils.deprecation import RemovedInDjango21Warning
+from django.utils.encoding import force_bytes, force_text, iri_to_uri
+from django.utils.http import (
+    http_date, parse_etags, parse_http_date_safe, quote_etag,
+)
+from django.utils.timezone import get_current_timezone_name
+from django.utils.translation import get_language
+
+cc_delim_re = re.compile(r'\s*,\s*')
+
+logger = logging.getLogger('django.request')
+
+
+def patch_cache_control(response, **kwargs):
+    """
+    Patch the Cache-Control header by adding all keyword arguments to it.
+    The transformation is as follows:
+
+    * All keyword parameter names are turned to lowercase, and underscores
+      are converted to hyphens.
+    * If the value of a parameter is True (exactly True, not just a
+      true value), only the parameter name is added to the header.
+    * All other parameters are added with their value, after applying
+      str() to it.
+    """
+    def dictitem(s):
+        t = s.split('=', 1)
+        if len(t) > 1:
+            return (t[0].lower(), t[1])
+        else:
+            return (t[0].lower(), True)
+
+    def dictvalue(t):
+        if t[1] is True:
+            return t[0]
+        else:
+            return '%s=%s' % (t[0], t[1])
+
+    if response.get('Cache-Control'):
+        cc = cc_delim_re.split(response['Cache-Control'])
+        cc = dict(dictitem(el) for el in cc)
+    else:
+        cc = {}
+
+    # If there's already a max-age header but we're being asked to set a new
+    # max-age, use the minimum of the two ages. In practice this happens when
+    # a decorator and a piece of middleware both operate on a given view.
+    if 'max-age' in cc and 'max_age' in kwargs:
+        kwargs['max_age'] = min(int(cc['max-age']), kwargs['max_age'])
+
+    # Allow overriding private caching and vice versa
+    if 'private' in cc and 'public' in kwargs:
+        del cc['private']
+    elif 'public' in cc and 'private' in kwargs:
+        del cc['public']
+
+    for (k, v) in kwargs.items():
+        cc[k.replace('_', '-')] = v
+    cc = ', '.join(dictvalue(el) for el in cc.items())
+    response['Cache-Control'] = cc
+
+
+def get_max_age(response):
+    """
+    Return the max-age from the response Cache-Control header as an integer,
+    or None if it wasn't found or wasn't an integer.
+    """
+    if not response.has_header('Cache-Control'):
+        return
+    cc = dict(_to_tuple(el) for el in cc_delim_re.split(response['Cache-Control']))
+    if 'max-age' in cc:
+        try:
+            return int(cc['max-age'])
+        except (ValueError, TypeError):
+            pass
+
+
+def set_response_etag(response):
+    if not response.streaming:
+        response['ETag'] = quote_etag(hashlib.md5(response.content).hexdigest())
+    return response
+
+
+def _precondition_failed(request):
+    logger.warning(
+        'Precondition Failed: %s', request.path,
+        extra={
+            'status_code': 412,
+            'request': request,
+        },
+    )
+    return HttpResponse(status=412)
+
+
+def _not_modified(request, response=None):
+    new_response = HttpResponseNotModified()
+    if response:
+        # Preserve the headers required by Section 4.1 of RFC 7232, as well as
+        # Last-Modified.
+        for header in ('Cache-Control', 'Content-Location', 'Date', 'ETag', 'Expires', 'Last-Modified', 'Vary'):
+            if header in response:
+                new_response[header] = response[header]
+
+        # Preserve cookies as per the cookie specification: "If a proxy server
+        # receives a response which contains a Set-cookie header, it should
+        # propagate the Set-cookie header to the client, regardless of whether
+        # the response was 304 (Not Modified) or 200 (OK).
+        # https://curl.haxx.se/rfc/cookie_spec.html
+        new_response.cookies = response.cookies
+    return new_response
+
+
+def get_conditional_response(request, etag=None, last_modified=None, response=None):
+    # Only return conditional responses on successful requests.
+    if response and not (200 <= response.status_code < 300):
+        return response
+
+    # Get HTTP request headers.
+    if_match_etags = parse_etags(request.META.get('HTTP_IF_MATCH', ''))
+    if_unmodified_since = request.META.get('HTTP_IF_UNMODIFIED_SINCE')
+    if if_unmodified_since:
+        if_unmodified_since = parse_http_date_safe(if_unmodified_since)
+    if_none_match_etags = parse_etags(request.META.get('HTTP_IF_NONE_MATCH', ''))
+    if_modified_since = request.META.get('HTTP_IF_MODIFIED_SINCE')
+    if if_modified_since:
+        if_modified_since = parse_http_date_safe(if_modified_since)
+
+    # Step 1 of section 6 of RFC 7232: Test the If-Match precondition.
+    if if_match_etags and not _if_match_passes(etag, if_match_etags):
+        return _precondition_failed(request)
+
+    # Step 2: Test the If-Unmodified-Since precondition.
+    if (not if_match_etags and if_unmodified_since and
+            not _if_unmodified_since_passes(last_modified, if_unmodified_since)):
+        return _precondition_failed(request)
+
+    # Step 3: Test the If-None-Match precondition.
+    if if_none_match_etags and not _if_none_match_passes(etag, if_none_match_etags):
+        if request.method in ('GET', 'HEAD'):
+            return _not_modified(request, response)
+        else:
+            return _precondition_failed(request)
+
+    # Step 4: Test the If-Modified-Since precondition.
+    if (not if_none_match_etags and if_modified_since and
+            not _if_modified_since_passes(last_modified, if_modified_since)):
+        if request.method in ('GET', 'HEAD'):
+            return _not_modified(request, response)
+
+    # Step 5: Test the If-Range precondition (not supported).
+    # Step 6: Return original response since there isn't a conditional response.
+    return response
+
+
+def _if_match_passes(target_etag, etags):
+    """
+    Test the If-Match comparison as defined in section 3.1 of RFC 7232.
+    """
+    if not target_etag:
+        # If there isn't an ETag, then there can't be a match.
+        return False
+    elif etags == ['*']:
+        # The existence of an ETag means that there is "a current
+        # representation for the target resource", even if the ETag is weak,
+        # so there is a match to '*'.
+        return True
+    elif target_etag.startswith('W/'):
+        # A weak ETag can never strongly match another ETag.
+        return False
+    else:
+        # Since the ETag is strong, this will only return True if there's a
+        # strong match.
+        return target_etag in etags
+
+
+def _if_unmodified_since_passes(last_modified, if_unmodified_since):
+    """
+    Test the If-Unmodified-Since comparison as defined in section 3.4 of
+    RFC 7232.
+    """
+    return last_modified and last_modified <= if_unmodified_since
+
+
+def _if_none_match_passes(target_etag, etags):
+    """
+    Test the If-None-Match comparison as defined in section 3.2 of RFC 7232.
+    """
+    if not target_etag:
+        # If there isn't an ETag, then there isn't a match.
+        return True
+    elif etags == ['*']:
+        # The existence of an ETag means that there is "a current
+        # representation for the target resource", so there is a match to '*'.
+        return False
+    else:
+        # The comparison should be weak, so look for a match after stripping
+        # off any weak indicators.
+        target_etag = target_etag.strip('W/')
+        etags = (etag.strip('W/') for etag in etags)
+        return target_etag not in etags
+
+
+def _if_modified_since_passes(last_modified, if_modified_since):
+    """
+    Test the If-Modified-Since comparison as defined in section 3.3 of RFC 7232.
+    """
+    return not last_modified or last_modified > if_modified_since
+
+
+def patch_response_headers(response, cache_timeout=None):
+    """
+    Add HTTP caching headers to the given HttpResponse: Expires and
+    Cache-Control.
+
+    Each header is only added if it isn't already set.
+
+    cache_timeout is in seconds. The CACHE_MIDDLEWARE_SECONDS setting is used
+    by default.
+    """
+    if cache_timeout is None:
+        cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
+    if cache_timeout < 0:
+        cache_timeout = 0  # Can't have max-age negative
+    if settings.USE_ETAGS and not response.has_header('ETag'):
+        warnings.warn(
+            "The USE_ETAGS setting is deprecated in favor of "
+            "ConditionalGetMiddleware which sets the ETag regardless of the "
+            "setting. patch_response_headers() won't do ETag processing in "
+            "Django 2.1.",
+            RemovedInDjango21Warning
+        )
+        if hasattr(response, 'render') and callable(response.render):
+            response.add_post_render_callback(set_response_etag)
+        else:
+            response = set_response_etag(response)
+    if not response.has_header('Expires'):
+        response['Expires'] = http_date(time.time() + cache_timeout)
+    patch_cache_control(response, max_age=cache_timeout)
+
+
+def add_never_cache_headers(response):
+    """
+    Add headers to a response to indicate that a page should never be cached.
+    """
+    patch_response_headers(response, cache_timeout=-1)
+    patch_cache_control(response, no_cache=True, no_store=True, must_revalidate=True)
+
+
+def patch_vary_headers(response, newheaders):
+    """
+    Add (or update) the "Vary" header in the given HttpResponse object.
+    newheaders is a list of header names that should be in "Vary". Existing
+    headers in "Vary" aren't removed.
+    """
+    # Note that we need to keep the original order intact, because cache
+    # implementations may rely on the order of the Vary contents in, say,
+    # computing an MD5 hash.
+    if response.has_header('Vary'):
+        vary_headers = cc_delim_re.split(response['Vary'])
+    else:
+        vary_headers = []
+    # Use .lower() here so we treat headers as case-insensitive.
+    existing_headers = {header.lower() for header in vary_headers}
+    additional_headers = [newheader for newheader in newheaders
+                          if newheader.lower() not in existing_headers]
+    response['Vary'] = ', '.join(vary_headers + additional_headers)
+
+
+def has_vary_header(response, header_query):
+    """
+    Check to see if the response has a given header name in its Vary header.
+    """
+    if not response.has_header('Vary'):
+        return False
+    vary_headers = cc_delim_re.split(response['Vary'])
+    existing_headers = {header.lower() for header in vary_headers}
+    return header_query.lower() in existing_headers
+
+
+def _i18n_cache_key_suffix(request, cache_key):
+    """If necessary, add the current locale or time zone to the cache key."""
+    if settings.USE_I18N or settings.USE_L10N:
+        # first check if LocaleMiddleware or another middleware added
+        # LANGUAGE_CODE to request, then fall back to the active language
+        # which in turn can also fall back to settings.LANGUAGE_CODE
+        cache_key += '.%s' % getattr(request, 'LANGUAGE_CODE', get_language())
+    if settings.USE_TZ:
+        # The datetime module doesn't restrict the output of tzname().
+        # Windows is known to use non-standard, locale-dependent names.
+        # User-defined tzinfo classes may return absolutely anything.
+        # Hence this paranoid conversion to create a valid cache key.
+        tz_name = force_text(get_current_timezone_name(), errors='ignore')
+        cache_key += '.%s' % tz_name.encode('ascii', 'ignore').decode('ascii').replace(' ', '_')
+    return cache_key
+
+
+def _generate_cache_key(request, method, headerlist, key_prefix):
+    """Return a cache key from the headers given in the header list."""
+    ctx = hashlib.md5()
+    for header in headerlist:
+        value = request.META.get(header)
+        if value is not None:
+            ctx.update(force_bytes(value))
+    url = hashlib.md5(force_bytes(iri_to_uri(request.build_absolute_uri())))
+    cache_key = 'views.decorators.cache.cache_page.%s.%s.%s.%s' % (
+        key_prefix, method, url.hexdigest(), ctx.hexdigest())
+    return _i18n_cache_key_suffix(request, cache_key)
+
+
+def _generate_cache_header_key(key_prefix, request):
+    """Return a cache key for the header cache."""
+    url = hashlib.md5(force_bytes(iri_to_uri(request.build_absolute_uri())))
+    cache_key = 'views.decorators.cache.cache_header.%s.%s' % (
+        key_prefix, url.hexdigest())
+    return _i18n_cache_key_suffix(request, cache_key)
+
+
+def get_cache_key(request, key_prefix=None, method='GET', cache=None):
+    """
+    Return a cache key based on the request URL and query. It can be used
+    in the request phase because it pulls the list of headers to take into
+    account from the global URL registry and uses those to build a cache key
+    to check against.
+
+    If there isn't a headerlist stored, return None, indicating that the page
+    needs to be rebuilt.
+    """
+    if key_prefix is None:
+        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
+    cache_key = _generate_cache_header_key(key_prefix, request)
+    if cache is None:
+        cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
+    headerlist = cache.get(cache_key)
+    if headerlist is not None:
+        return _generate_cache_key(request, method, headerlist, key_prefix)
+    else:
+        return None
+
+
+def learn_cache_key(request, response, cache_timeout=None, key_prefix=None, cache=None):
+    """
+    Learn what headers to take into account for some request URL from the
+    response object. Store those headers in a global URL registry so that
+    later access to that URL will know what headers to take into account
+    without building the response object itself. The headers are named in the
+    Vary header of the response, but we want to prevent response generation.
+
+    The list of headers to use for cache key generation is stored in the same
+    cache as the pages themselves. If the cache ages some data out of the
+    cache, this just means that we have to build the response once to get at
+    the Vary header and so at the list of headers to use for the cache key.
+    """
+    if key_prefix is None:
+        key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
+    if cache_timeout is None:
+        cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
+    cache_key = _generate_cache_header_key(key_prefix, request)
+    if cache is None:
+        cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
+    if response.has_header('Vary'):
+        is_accept_language_redundant = settings.USE_I18N or settings.USE_L10N
+        # If i18n or l10n are used, the generated cache key will be suffixed
+        # with the current locale. Adding the raw value of Accept-Language is
+        # redundant in that case and would result in storing the same content
+        # under multiple keys in the cache. See #18191 for details.
+        headerlist = []
+        for header in cc_delim_re.split(response['Vary']):
+            header = header.upper().replace('-', '_')
+            if header == 'ACCEPT_LANGUAGE' and is_accept_language_redundant:
+                continue
+            headerlist.append('HTTP_' + header)
+        headerlist.sort()
+        cache.set(cache_key, headerlist, cache_timeout)
+        return _generate_cache_key(request, request.method, headerlist, key_prefix)
+    else:
+        # if there is no Vary header, we still need a cache key
+        # for the request.build_absolute_uri()
+        cache.set(cache_key, [], cache_timeout)
+        return _generate_cache_key(request, request.method, [], key_prefix)
+
+
+def _to_tuple(s):
+    t = s.split('=', 1)
+    if len(t) == 2:
+        return t[0].lower(), t[1]
+    return t[0].lower(), True

flex/lib/python3.6/site-packages/django/utils/crypto.py

@@ -0,0 +1,85 @@
+"""
+Django's standard crypto functions and utilities.
+"""
+import hashlib
+import hmac
+import random
+import time
+
+from django.conf import settings
+from django.utils.encoding import force_bytes
+
+# Use the system PRNG if possible
+try:
+    random = random.SystemRandom()
+    using_sysrandom = True
+except NotImplementedError:
+    import warnings
+    warnings.warn('A secure pseudo-random number generator is not available '
+                  'on your system. Falling back to Mersenne Twister.')
+    using_sysrandom = False
+
+
+def salted_hmac(key_salt, value, secret=None):
+    """
+    Return the HMAC-SHA1 of 'value', using a key generated from key_salt and a
+    secret (which defaults to settings.SECRET_KEY).
+
+    A different key_salt should be passed in for every application of HMAC.
+    """
+    if secret is None:
+        secret = settings.SECRET_KEY
+
+    key_salt = force_bytes(key_salt)
+    secret = force_bytes(secret)
+
+    # We need to generate a derived key from our base key.  We can do this by
+    # passing the key_salt and our base key through a pseudo-random function and
+    # SHA1 works nicely.
+    key = hashlib.sha1(key_salt + secret).digest()
+
+    # If len(key_salt + secret) > sha_constructor().block_size, the above
+    # line is redundant and could be replaced by key = key_salt + secret, since
+    # the hmac module does the same thing for keys longer than the block size.
+    # However, we need to ensure that we *always* do this.
+    return hmac.new(key, msg=force_bytes(value), digestmod=hashlib.sha1)
+
+
+def get_random_string(length=12,
+                      allowed_chars='abcdefghijklmnopqrstuvwxyz'
+                                    'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'):
+    """
+    Return a securely generated random string.
+
+    The default length of 12 with the a-z, A-Z, 0-9 character set returns
+    a 71-bit value. log_2((26+26+10)^12) =~ 71 bits
+    """
+    if not using_sysrandom:
+        # This is ugly, and a hack, but it makes things better than
+        # the alternative of predictability. This re-seeds the PRNG
+        # using a value that is hard for an attacker to predict, every
+        # time a random string is required. This may change the
+        # properties of the chosen random sequence slightly, but this
+        # is better than absolute predictability.
+        random.seed(
+            hashlib.sha256(
+                ('%s%s%s' % (random.getstate(), time.time(), settings.SECRET_KEY)).encode()
+            ).digest()
+        )
+    return ''.join(random.choice(allowed_chars) for i in range(length))
+
+
+def constant_time_compare(val1, val2):
+    """Return True if the two strings are equal, False otherwise."""
+    return hmac.compare_digest(force_bytes(val1), force_bytes(val2))
+
+
+def pbkdf2(password, salt, iterations, dklen=0, digest=None):
+    """Return the hash of password using pbkdf2."""
+    if digest is None:
+        digest = hashlib.sha256
+    if not dklen:
+        dklen = None
+    password = force_bytes(password)
+    salt = force_bytes(salt)
+    return hashlib.pbkdf2_hmac(digest().name, password, salt, iterations, dklen)

flex/lib/python3.6/site-packages/django/utils/datastructures.py

@@ -0,0 +1,286 @@
+import copy
+from collections import OrderedDict
+
+
+class OrderedSet:
+    """
+    A set which keeps the ordering of the inserted items.
+    Currently backs onto OrderedDict.
+    """
+
+    def __init__(self, iterable=None):
+        self.dict = OrderedDict.fromkeys(iterable or ())
+
+    def add(self, item):
+        self.dict[item] = None
+
+    def remove(self, item):
+        del self.dict[item]
+
+    def discard(self, item):
+        try:
+            self.remove(item)
+        except KeyError:
+            pass
+
+    def __iter__(self):
+        return iter(self.dict)
+
+    def __contains__(self, item):
+        return item in self.dict
+
+    def __bool__(self):
+        return bool(self.dict)
+
+    def __len__(self):
+        return len(self.dict)
+
+
+class MultiValueDictKeyError(KeyError):
+    pass
+
+
+class MultiValueDict(dict):
+    """
+    A subclass of dictionary customized to handle multiple values for the
+    same key.
+
+    >>> d = MultiValueDict({'name': ['Adrian', 'Simon'], 'position': ['Developer']})
+    >>> d['name']
+    'Simon'
+    >>> d.getlist('name')
+    ['Adrian', 'Simon']
+    >>> d.getlist('doesnotexist')
+    []
+    >>> d.getlist('doesnotexist', ['Adrian', 'Simon'])
+    ['Adrian', 'Simon']
+    >>> d.get('lastname', 'nonexistent')
+    'nonexistent'
+    >>> d.setlist('lastname', ['Holovaty', 'Willison'])
+
+    This class exists to solve the irritating problem raised by cgi.parse_qs,
+    which returns a list for every key, even though most Web forms submit
+    single name-value pairs.
+    """
+    def __init__(self, key_to_list_mapping=()):
+        super().__init__(key_to_list_mapping)
+
+    def __repr__(self):
+        return "<%s: %s>" % (self.__class__.__name__, super().__repr__())
+
+    def __getitem__(self, key):
+        """
+        Return the last data value for this key, or [] if it's an empty list;
+        raise KeyError if not found.
+        """
+        try:
+            list_ = super().__getitem__(key)
+        except KeyError:
+            raise MultiValueDictKeyError(key)
+        try:
+            return list_[-1]
+        except IndexError:
+            return []
+
+    def __setitem__(self, key, value):
+        super().__setitem__(key, [value])
+
+    def __copy__(self):
+        return self.__class__([
+            (k, v[:])
+            for k, v in self.lists()
+        ])
+
+    def __deepcopy__(self, memo):
+        result = self.__class__()
+        memo[id(self)] = result
+        for key, value in dict.items(self):
+            dict.__setitem__(result, copy.deepcopy(key, memo),
+                             copy.deepcopy(value, memo))
+        return result
+
+    def __getstate__(self):
+        obj_dict = self.__dict__.copy()
+        obj_dict['_data'] = {k: self._getlist(k) for k in self}
+        return obj_dict
+
+    def __setstate__(self, obj_dict):
+        data = obj_dict.pop('_data', {})
+        for k, v in data.items():
+            self.setlist(k, v)
+        self.__dict__.update(obj_dict)
+
+    def get(self, key, default=None):
+        """
+        Return the last data value for the passed key. If key doesn't exist
+        or value is an empty list, return `default`.
+        """
+        try:
+            val = self[key]
+        except KeyError:
+            return default
+        if val == []:
+            return default
+        return val
+
+    def _getlist(self, key, default=None, force_list=False):
+        """
+        Return a list of values for the key.
+
+        Used internally to manipulate values list. If force_list is True,
+        return a new copy of values.
+        """
+        try:
+            values = super().__getitem__(key)
+        except KeyError:
+            if default is None:
+                return []
+            return default
+        else:
+            if force_list:
+                values = list(values) if values is not None else None
+            return values
+
+    def getlist(self, key, default=None):
+        """
+        Return the list of values for the key. If key doesn't exist, return a
+        default value.
+        """
+        return self._getlist(key, default, force_list=True)
+
+    def setlist(self, key, list_):
+        super().__setitem__(key, list_)
+
+    def setdefault(self, key, default=None):
+        if key not in self:
+            self[key] = default
+            # Do not return default here because __setitem__() may store
+            # another value -- QueryDict.__setitem__() does. Look it up.
+        return self[key]
+
+    def setlistdefault(self, key, default_list=None):
+        if key not in self:
+            if default_list is None:
+                default_list = []
+            self.setlist(key, default_list)
+            # Do not return default_list here because setlist() may store
+            # another value -- QueryDict.setlist() does. Look it up.
+        return self._getlist(key)
+
+    def appendlist(self, key, value):
+        """Append an item to the internal list associated with key."""
+        self.setlistdefault(key).append(value)
+
+    def items(self):
+        """
+        Yield (key, value) pairs, where value is the last item in the list
+        associated with the key.
+        """
+        for key in self:
+            yield key, self[key]
+
+    def lists(self):
+        """Yield (key, list) pairs."""
+        return iter(super().items())
+
+    def values(self):
+        """Yield the last value on every key list."""
+        for key in self:
+            yield self[key]
+
+    def copy(self):
+        """Return a shallow copy of this object."""
+        return copy.copy(self)
+
+    def update(self, *args, **kwargs):
+        """Extend rather than replace existing key lists."""
+        if len(args) > 1:
+            raise TypeError("update expected at most 1 arguments, got %d" % len(args))
+        if args:
+            other_dict = args[0]
+            if isinstance(other_dict, MultiValueDict):
+                for key, value_list in other_dict.lists():
+                    self.setlistdefault(key).extend(value_list)
+            else:
+                try:
+                    for key, value in other_dict.items():
+                        self.setlistdefault(key).append(value)
+                except TypeError:
+                    raise ValueError("MultiValueDict.update() takes either a MultiValueDict or dictionary")
+        for key, value in kwargs.items():
+            self.setlistdefault(key).append(value)
+
+    def dict(self):
+        """Return current object as a dict with singular values."""
+        return {key: self[key] for key in self}
+
+
+class ImmutableList(tuple):
+    """
+    A tuple-like object that raises useful errors when it is asked to mutate.
+
+    Example::
+
+        >>> a = ImmutableList(range(5), warning="You cannot mutate this.")
+        >>> a[3] = '4'
+        Traceback (most recent call last):
+            ...
+        AttributeError: You cannot mutate this.
+    """
+
+    def __new__(cls, *args, warning='ImmutableList object is immutable.', **kwargs):
+        self = tuple.__new__(cls, *args, **kwargs)
+        self.warning = warning
+        return self
+
+    def complain(self, *wargs, **kwargs):
+        if isinstance(self.warning, Exception):
+            raise self.warning
+        else:
+            raise AttributeError(self.warning)
+
+    # All list mutation functions complain.
+    __delitem__ = complain
+    __delslice__ = complain
+    __iadd__ = complain
+    __imul__ = complain
+    __setitem__ = complain
+    __setslice__ = complain
+    append = complain
+    extend = complain
+    insert = complain
+    pop = complain
+    remove = complain
+    sort = complain
+    reverse = complain
+
+
+class DictWrapper(dict):
+    """
+    Wrap accesses to a dictionary so that certain values (those starting with
+    the specified prefix) are passed through a function before being returned.
+    The prefix is removed before looking up the real value.
+
+    Used by the SQL construction code to ensure that values are correctly
+    quoted before being used.
+    """
+    def __init__(self, data, func, prefix):
+        super().__init__(data)
+        self.func = func
+        self.prefix = prefix
+
+    def __getitem__(self, key):
+        """
+        Retrieve the real value after stripping the prefix string (if
+        present). If the prefix is present, pass the value through self.func
+        before returning, otherwise return the raw value.
+        """
+        if key.startswith(self.prefix):
+            use_func = True
+            key = key[len(self.prefix):]
+        else:
+            use_func = False
+        value = super().__getitem__(key)
+        if use_func:
+            return self.func(value)
+        return value

flex/lib/python3.6/site-packages/django/utils/dateformat.py

@@ -0,0 +1,367 @@
+"""
+PHP date() style date formatting
+See http://www.php.net/date for format strings
+
+Usage:
+>>> import datetime
+>>> d = datetime.datetime.now()
+>>> df = DateFormat(d)
+>>> print(df.format('jS F Y H:i'))
+7th October 2003 11:39
+>>>
+"""
+import calendar
+import datetime
+import re
+import time
+
+from django.utils.dates import (
+    MONTHS, MONTHS_3, MONTHS_ALT, MONTHS_AP, WEEKDAYS, WEEKDAYS_ABBR,
+)
+from django.utils.timezone import get_default_timezone, is_aware, is_naive
+from django.utils.translation import gettext as _
+
+re_formatchars = re.compile(r'(?<!\\)([aAbBcdDeEfFgGhHiIjlLmMnNoOPrsStTUuwWyYzZ])')
+re_escaped = re.compile(r'\\(.)')
+
+
+class Formatter:
+    def format(self, formatstr):
+        pieces = []
+        for i, piece in enumerate(re_formatchars.split(str(formatstr))):
+            if i % 2:
+                if type(self.data) is datetime.date and hasattr(TimeFormat, piece):
+                    raise TypeError(
+                        "The format for date objects may not contain "
+                        "time-related format specifiers (found '%s')." % piece
+                    )
+                pieces.append(str(getattr(self, piece)()))
+            elif piece:
+                pieces.append(re_escaped.sub(r'\1', piece))
+        return ''.join(pieces)
+
+
+class TimeFormat(Formatter):
+
+    def __init__(self, obj):
+        self.data = obj
+        self.timezone = None
+
+        # We only support timezone when formatting datetime objects,
+        # not date objects (timezone information not appropriate),
+        # or time objects (against established django policy).
+        if isinstance(obj, datetime.datetime):
+            if is_naive(obj):
+                self.timezone = get_default_timezone()
+            else:
+                self.timezone = obj.tzinfo
+
+    def a(self):
+        "'a.m.' or 'p.m.'"
+        if self.data.hour > 11:
+            return _('p.m.')
+        return _('a.m.')
+
+    def A(self):
+        "'AM' or 'PM'"
+        if self.data.hour > 11:
+            return _('PM')
+        return _('AM')
+
+    def B(self):
+        "Swatch Internet time"
+        raise NotImplementedError('may be implemented in a future release')
+
+    def e(self):
+        """
+        Timezone name.
+
+        If timezone information is not available, return an empty string.
+        """
+        if not self.timezone:
+            return ""
+
+        try:
+            if hasattr(self.data, 'tzinfo') and self.data.tzinfo:
+                return self.data.tzname() or ''
+        except NotImplementedError:
+            pass
+        return ""
+
+    def f(self):
+        """
+        Time, in 12-hour hours and minutes, with minutes left off if they're
+        zero.
+        Examples: '1', '1:30', '2:05', '2'
+        Proprietary extension.
+        """
+        if self.data.minute == 0:
+            return self.g()
+        return '%s:%s' % (self.g(), self.i())
+
+    def g(self):
+        "Hour, 12-hour format without leading zeros; i.e. '1' to '12'"
+        if self.data.hour == 0:
+            return 12
+        if self.data.hour > 12:
+            return self.data.hour - 12
+        return self.data.hour
+
+    def G(self):
+        "Hour, 24-hour format without leading zeros; i.e. '0' to '23'"
+        return self.data.hour
+
+    def h(self):
+        "Hour, 12-hour format; i.e. '01' to '12'"
+        return '%02d' % self.g()
+
+    def H(self):
+        "Hour, 24-hour format; i.e. '00' to '23'"
+        return '%02d' % self.G()
+
+    def i(self):
+        "Minutes; i.e. '00' to '59'"
+        return '%02d' % self.data.minute
+
+    def O(self):  # NOQA: E743
+        """
+        Difference to Greenwich time in hours; e.g. '+0200', '-0430'.
+
+        If timezone information is not available, return an empty string.
+        """
+        if not self.timezone:
+            return ""
+
+        seconds = self.Z()
+        if seconds == "":
+            return ""
+        sign = '-' if seconds < 0 else '+'
+        seconds = abs(seconds)
+        return "%s%02d%02d" % (sign, seconds // 3600, (seconds // 60) % 60)
+
+    def P(self):
+        """
+        Time, in 12-hour hours, minutes and 'a.m.'/'p.m.', with minutes left off
+        if they're zero and the strings 'midnight' and 'noon' if appropriate.
+        Examples: '1 a.m.', '1:30 p.m.', 'midnight', 'noon', '12:30 p.m.'
+        Proprietary extension.
+        """
+        if self.data.minute == 0 and self.data.hour == 0:
+            return _('midnight')
+        if self.data.minute == 0 and self.data.hour == 12:
+            return _('noon')
+        return '%s %s' % (self.f(), self.a())
+
+    def s(self):
+        "Seconds; i.e. '00' to '59'"
+        return '%02d' % self.data.second
+
+    def T(self):
+        """
+        Time zone of this machine; e.g. 'EST' or 'MDT'.
+
+        If timezone information is not available, return an empty string.
+        """
+        if not self.timezone:
+            return ""
+
+        name = None
+        try:
+            name = self.timezone.tzname(self.data)
+        except Exception:
+            # pytz raises AmbiguousTimeError during the autumn DST change.
+            # This happens mainly when __init__ receives a naive datetime
+            # and sets self.timezone = get_default_timezone().
+            pass
+        if name is None:
+            name = self.format('O')
+        return str(name)
+
+    def u(self):
+        "Microseconds; i.e. '000000' to '999999'"
+        return '%06d' % self.data.microsecond
+
+    def Z(self):
+        """
+        Time zone offset in seconds (i.e. '-43200' to '43200'). The offset for
+        timezones west of UTC is always negative, and for those east of UTC is
+        always positive.
+
+        If timezone information is not available, return an empty string.
+        """
+        if not self.timezone:
+            return ""
+
+        try:
+            offset = self.timezone.utcoffset(self.data)
+        except Exception:
+            # pytz raises AmbiguousTimeError during the autumn DST change.
+            # This happens mainly when __init__ receives a naive datetime
+            # and sets self.timezone = get_default_timezone().
+            return ""
+
+        # `offset` is a datetime.timedelta. For negative values (to the west of
+        # UTC) only days can be negative (days=-1) and seconds are always
+        # positive. e.g. UTC-1 -> timedelta(days=-1, seconds=82800, microseconds=0)
+        # Positive offsets have days=0
+        return offset.days * 86400 + offset.seconds
+
+
+class DateFormat(TimeFormat):
+    year_days = [None, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334]
+
+    def b(self):
+        "Month, textual, 3 letters, lowercase; e.g. 'jan'"
+        return MONTHS_3[self.data.month]
+
+    def c(self):
+        """
+        ISO 8601 Format
+        Example : '2008-01-02T10:30:00.000123'
+        """
+        return self.data.isoformat()
+
+    def d(self):
+        "Day of the month, 2 digits with leading zeros; i.e. '01' to '31'"
+        return '%02d' % self.data.day
+
+    def D(self):
+        "Day of the week, textual, 3 letters; e.g. 'Fri'"
+        return WEEKDAYS_ABBR[self.data.weekday()]
+
+    def E(self):
+        "Alternative month names as required by some locales. Proprietary extension."
+        return MONTHS_ALT[self.data.month]
+
+    def F(self):
+        "Month, textual, long; e.g. 'January'"
+        return MONTHS[self.data.month]
+
+    def I(self):  # NOQA: E743
+        "'1' if Daylight Savings Time, '0' otherwise."
+        try:
+            if self.timezone and self.timezone.dst(self.data):
+                return '1'
+            else:
+                return '0'
+        except Exception:
+            # pytz raises AmbiguousTimeError during the autumn DST change.
+            # This happens mainly when __init__ receives a naive datetime
+            # and sets self.timezone = get_default_timezone().
+            return ''
+
+    def j(self):
+        "Day of the month without leading zeros; i.e. '1' to '31'"
+        return self.data.day
+
+    def l(self):  # NOQA: E743
+        "Day of the week, textual, long; e.g. 'Friday'"
+        return WEEKDAYS[self.data.weekday()]
+
+    def L(self):
+        "Boolean for whether it is a leap year; i.e. True or False"
+        return calendar.isleap(self.data.year)
+
+    def m(self):
+        "Month; i.e. '01' to '12'"
+        return '%02d' % self.data.month
+
+    def M(self):
+        "Month, textual, 3 letters; e.g. 'Jan'"
+        return MONTHS_3[self.data.month].title()
+
+    def n(self):
+        "Month without leading zeros; i.e. '1' to '12'"
+        return self.data.month
+
+    def N(self):
+        "Month abbreviation in Associated Press style. Proprietary extension."
+        return MONTHS_AP[self.data.month]
+
+    def o(self):
+        "ISO 8601 year number matching the ISO week number (W)"
+        return self.data.isocalendar()[0]
+
+    def r(self):
+        "RFC 5322 formatted date; e.g. 'Thu, 21 Dec 2000 16:01:07 +0200'"
+        return self.format('D, j M Y H:i:s O')
+
+    def S(self):
+        "English ordinal suffix for the day of the month, 2 characters; i.e. 'st', 'nd', 'rd' or 'th'"
+        if self.data.day in (11, 12, 13):  # Special case
+            return 'th'
+        last = self.data.day % 10
+        if last == 1:
+            return 'st'
+        if last == 2:
+            return 'nd'
+        if last == 3:
+            return 'rd'
+        return 'th'
+
+    def t(self):
+        "Number of days in the given month; i.e. '28' to '31'"
+        return '%02d' % calendar.monthrange(self.data.year, self.data.month)[1]
+
+    def U(self):
+        "Seconds since the Unix epoch (January 1 1970 00:00:00 GMT)"
+        if isinstance(self.data, datetime.datetime) and is_aware(self.data):
+            return int(calendar.timegm(self.data.utctimetuple()))
+        else:
+            return int(time.mktime(self.data.timetuple()))
+
+    def w(self):
+        "Day of the week, numeric, i.e. '0' (Sunday) to '6' (Saturday)"
+        return (self.data.weekday() + 1) % 7
+
+    def W(self):
+        "ISO-8601 week number of year, weeks starting on Monday"
+        # Algorithm from http://www.personal.ecu.edu/mccartyr/ISOwdALG.txt
+        jan1_weekday = self.data.replace(month=1, day=1).weekday() + 1
+        weekday = self.data.weekday() + 1
+        day_of_year = self.z()
+        if day_of_year <= (8 - jan1_weekday) and jan1_weekday > 4:
+            if jan1_weekday == 5 or (jan1_weekday == 6 and calendar.isleap(self.data.year - 1)):
+                week_number = 53
+            else:
+                week_number = 52
+        else:
+            if calendar.isleap(self.data.year):
+                i = 366
+            else:
+                i = 365
+            if (i - day_of_year) < (4 - weekday):
+                week_number = 1
+            else:
+                j = day_of_year + (7 - weekday) + (jan1_weekday - 1)
+                week_number = j // 7
+                if jan1_weekday > 4:
+                    week_number -= 1
+        return week_number
+
+    def y(self):
+        "Year, 2 digits; e.g. '99'"
+        return str(self.data.year)[2:]
+
+    def Y(self):
+        "Year, 4 digits; e.g. '1999'"
+        return self.data.year
+
+    def z(self):
+        "Day of the year; i.e. '0' to '365'"
+        doy = self.year_days[self.data.month] + self.data.day
+        if self.L() and self.data.month > 2:
+            doy += 1
+        return doy
+
+
+def format(value, format_string):
+    "Convenience function"
+    df = DateFormat(value)
+    return df.format(format_string)
+
+
+def time_format(value, format_string):
+    "Convenience function"
+    tf = TimeFormat(value)
+    return tf.format(format_string)

flex/lib/python3.6/site-packages/django/utils/dateparse.py

@@ -0,0 +1,146 @@
+"""Functions to parse datetime objects."""
+
+# We're using regular expressions rather than time.strptime because:
+# - They provide both validation and parsing.
+# - They're more flexible for datetimes.
+# - The date/datetime/time constructors produce friendlier error messages.
+
+import datetime
+import re
+
+from django.utils.timezone import get_fixed_timezone, utc
+
+date_re = re.compile(
+    r'(?P<year>\d{4})-(?P<month>\d{1,2})-(?P<day>\d{1,2})$'
+)
+
+time_re = re.compile(
+    r'(?P<hour>\d{1,2}):(?P<minute>\d{1,2})'
+    r'(?::(?P<second>\d{1,2})(?:\.(?P<microsecond>\d{1,6})\d{0,6})?)?'
+)
+
+datetime_re = re.compile(
+    r'(?P<year>\d{4})-(?P<month>\d{1,2})-(?P<day>\d{1,2})'
+    r'[T ](?P<hour>\d{1,2}):(?P<minute>\d{1,2})'
+    r'(?::(?P<second>\d{1,2})(?:\.(?P<microsecond>\d{1,6})\d{0,6})?)?'
+    r'(?P<tzinfo>Z|[+-]\d{2}(?::?\d{2})?)?$'
+)
+
+standard_duration_re = re.compile(
+    r'^'
+    r'(?:(?P<days>-?\d+) (days?, )?)?'
+    r'((?:(?P<hours>-?\d+):)(?=\d+:\d+))?'
+    r'(?:(?P<minutes>-?\d+):)?'
+    r'(?P<seconds>-?\d+)'
+    r'(?:\.(?P<microseconds>\d{1,6})\d{0,6})?'
+    r'$'
+)
+
+# Support the sections of ISO 8601 date representation that are accepted by
+# timedelta
+iso8601_duration_re = re.compile(
+    r'^(?P<sign>[-+]?)'
+    r'P'
+    r'(?:(?P<days>\d+(.\d+)?)D)?'
+    r'(?:T'
+    r'(?:(?P<hours>\d+(.\d+)?)H)?'
+    r'(?:(?P<minutes>\d+(.\d+)?)M)?'
+    r'(?:(?P<seconds>\d+(.\d+)?)S)?'
+    r')?'
+    r'$'
+)
+
+# Support PostgreSQL's day-time interval format, e.g. "3 days 04:05:06". The
+# year-month and mixed intervals cannot be converted to a timedelta and thus
+# aren't accepted.
+postgres_interval_re = re.compile(
+    r'^'
+    r'(?:(?P<days>-?\d+) (days? ?))?'
+    r'(?:(?P<sign>[-+])?'
+    r'(?P<hours>\d+):'
+    r'(?P<minutes>\d\d):'
+    r'(?P<seconds>\d\d)'
+    r'(?:\.(?P<microseconds>\d{1,6}))?'
+    r')?$'
+)
+
+
+def parse_date(value):
+    """Parse a string and return a datetime.date.
+
+    Raise ValueError if the input is well formatted but not a valid date.
+    Return None if the input isn't well formatted.
+    """
+    match = date_re.match(value)
+    if match:
+        kw = {k: int(v) for k, v in match.groupdict().items()}
+        return datetime.date(**kw)
+
+
+def parse_time(value):
+    """Parse a string and return a datetime.time.
+
+    This function doesn't support time zone offsets.
+
+    Raise ValueError if the input is well formatted but not a valid time.
+    Return None if the input isn't well formatted, in particular if it
+    contains an offset.
+    """
+    match = time_re.match(value)
+    if match:
+        kw = match.groupdict()
+        if kw['microsecond']:
+            kw['microsecond'] = kw['microsecond'].ljust(6, '0')
+        kw = {k: int(v) for k, v in kw.items() if v is not None}
+        return datetime.time(**kw)
+
+
+def parse_datetime(value):
+    """Parse a string and return a datetime.datetime.
+
+    This function supports time zone offsets. When the input contains one,
+    the output uses a timezone with a fixed offset from UTC.
+
+    Raise ValueError if the input is well formatted but not a valid datetime.
+    Return None if the input isn't well formatted.
+    """
+    match = datetime_re.match(value)
+    if match:
+        kw = match.groupdict()
+        if kw['microsecond']:
+            kw['microsecond'] = kw['microsecond'].ljust(6, '0')
+        tzinfo = kw.pop('tzinfo')
+        if tzinfo == 'Z':
+            tzinfo = utc
+        elif tzinfo is not None:
+            offset_mins = int(tzinfo[-2:]) if len(tzinfo) > 3 else 0
+            offset = 60 * int(tzinfo[1:3]) + offset_mins
+            if tzinfo[0] == '-':
+                offset = -offset
+            tzinfo = get_fixed_timezone(offset)
+        kw = {k: int(v) for k, v in kw.items() if v is not None}
+        kw['tzinfo'] = tzinfo
+        return datetime.datetime(**kw)
+
+
+def parse_duration(value):
+    """Parse a duration string and return a datetime.timedelta.
+
+    The preferred format for durations in Django is '%d %H:%M:%S.%f'.
+
+    Also supports ISO 8601 representation and PostgreSQL's day-time interval
+    format.
+    """
+    match = standard_duration_re.match(value)
+    if not match:
+        match = iso8601_duration_re.match(value) or postgres_interval_re.match(value)
+    if match:
+        kw = match.groupdict()
+        days = datetime.timedelta(float(kw.pop('days', 0) or 0))
+        sign = -1 if kw.pop('sign', '+') == '-' else 1
+        if kw.get('microseconds'):
+            kw['microseconds'] = kw['microseconds'].ljust(6, '0')
+        if kw.get('seconds') and kw.get('microseconds') and kw['seconds'].startswith('-'):
+            kw['microseconds'] = '-' + kw['microseconds']
+        kw = {k: float(v) for k, v in kw.items() if v is not None}
+        return days + sign * datetime.timedelta(**kw)

flex/lib/python3.6/site-packages/django/utils/dates.py

@@ -0,0 +1,57 @@
+"Commonly-used date structures"
+
+from django.utils.translation import gettext_lazy as _, pgettext_lazy
+
+WEEKDAYS = {
+    0: _('Monday'), 1: _('Tuesday'), 2: _('Wednesday'), 3: _('Thursday'), 4: _('Friday'),
+    5: _('Saturday'), 6: _('Sunday')
+}
+WEEKDAYS_ABBR = {
+    0: _('Mon'), 1: _('Tue'), 2: _('Wed'), 3: _('Thu'), 4: _('Fri'),
+    5: _('Sat'), 6: _('Sun')
+}
+WEEKDAYS_REV = {
+    'monday': 0, 'tuesday': 1, 'wednesday': 2, 'thursday': 3, 'friday': 4,
+    'saturday': 5, 'sunday': 6
+}
+MONTHS = {
+    1: _('January'), 2: _('February'), 3: _('March'), 4: _('April'), 5: _('May'), 6: _('June'),
+    7: _('July'), 8: _('August'), 9: _('September'), 10: _('October'), 11: _('November'),
+    12: _('December')
+}
+MONTHS_3 = {
+    1: _('jan'), 2: _('feb'), 3: _('mar'), 4: _('apr'), 5: _('may'), 6: _('jun'),
+    7: _('jul'), 8: _('aug'), 9: _('sep'), 10: _('oct'), 11: _('nov'), 12: _('dec')
+}
+MONTHS_3_REV = {
+    'jan': 1, 'feb': 2, 'mar': 3, 'apr': 4, 'may': 5, 'jun': 6, 'jul': 7, 'aug': 8,
+    'sep': 9, 'oct': 10, 'nov': 11, 'dec': 12
+}
+MONTHS_AP = {  # month names in Associated Press style
+    1: pgettext_lazy('abbrev. month', 'Jan.'),
+    2: pgettext_lazy('abbrev. month', 'Feb.'),
+    3: pgettext_lazy('abbrev. month', 'March'),
+    4: pgettext_lazy('abbrev. month', 'April'),
+    5: pgettext_lazy('abbrev. month', 'May'),
+    6: pgettext_lazy('abbrev. month', 'June'),
+    7: pgettext_lazy('abbrev. month', 'July'),
+    8: pgettext_lazy('abbrev. month', 'Aug.'),
+    9: pgettext_lazy('abbrev. month', 'Sept.'),
+    10: pgettext_lazy('abbrev. month', 'Oct.'),
+    11: pgettext_lazy('abbrev. month', 'Nov.'),
+    12: pgettext_lazy('abbrev. month', 'Dec.')
+}
+MONTHS_ALT = {  # required for long date representation by some locales
+    1: pgettext_lazy('alt. month', 'January'),
+    2: pgettext_lazy('alt. month', 'February'),
+    3: pgettext_lazy('alt. month', 'March'),
+    4: pgettext_lazy('alt. month', 'April'),
+    5: pgettext_lazy('alt. month', 'May'),
+    6: pgettext_lazy('alt. month', 'June'),
+    7: pgettext_lazy('alt. month', 'July'),
+    8: pgettext_lazy('alt. month', 'August'),
+    9: pgettext_lazy('alt. month', 'September'),
+    10: pgettext_lazy('alt. month', 'October'),
+    11: pgettext_lazy('alt. month', 'November'),
+    12: pgettext_lazy('alt. month', 'December')
+}

flex/lib/python3.6/site-packages/django/utils/datetime_safe.py

@@ -0,0 +1,105 @@
+# Python's datetime strftime doesn't handle dates before 1900.
+# These classes override date and datetime to support the formatting of a date
+# through its full "proleptic Gregorian" date range.
+#
+# Based on code submitted to comp.lang.python by Andrew Dalke
+#
+# >>> datetime_safe.date(1850, 8, 2).strftime("%Y/%m/%d was a %A")
+# '1850/08/02 was a Friday'
+
+import re
+import time as ttime
+from datetime import (
+    date as real_date, datetime as real_datetime, time as real_time,
+)
+
+
+class date(real_date):
+    def strftime(self, fmt):
+        return strftime(self, fmt)
+
+
+class datetime(real_datetime):
+    def strftime(self, fmt):
+        return strftime(self, fmt)
+
+    @classmethod
+    def combine(cls, date, time):
+        return cls(date.year, date.month, date.day,
+                   time.hour, time.minute, time.second,
+                   time.microsecond, time.tzinfo)
+
+    def date(self):
+        return date(self.year, self.month, self.day)
+
+
+class time(real_time):
+    pass
+
+
+def new_date(d):
+    "Generate a safe date from a datetime.date object."
+    return date(d.year, d.month, d.day)
+
+
+def new_datetime(d):
+    """
+    Generate a safe datetime from a datetime.date or datetime.datetime object.
+    """
+    kw = [d.year, d.month, d.day]
+    if isinstance(d, real_datetime):
+        kw.extend([d.hour, d.minute, d.second, d.microsecond, d.tzinfo])
+    return datetime(*kw)
+
+
+# This library does not support strftime's "%s" or "%y" format strings.
+# Allowed if there's an even number of "%"s because they are escaped.
+_illegal_formatting = re.compile(r"((^|[^%])(%%)*%[sy])")
+
+
+def _findall(text, substr):
+    # Also finds overlaps
+    sites = []
+    i = 0
+    while 1:
+        j = text.find(substr, i)
+        if j == -1:
+            break
+        sites.append(j)
+        i = j + 1
+    return sites
+
+
+def strftime(dt, fmt):
+    if dt.year >= 1900:
+        return super(type(dt), dt).strftime(fmt)
+    illegal_formatting = _illegal_formatting.search(fmt)
+    if illegal_formatting:
+        raise TypeError("strftime of dates before 1900 does not handle" + illegal_formatting.group(0))
+
+    year = dt.year
+    # For every non-leap year century, advance by
+    # 6 years to get into the 28-year repeat cycle
+    delta = 2000 - year
+    off = 6 * (delta // 100 + delta // 400)
+    year = year + off
+
+    # Move to around the year 2000
+    year = year + ((2000 - year) // 28) * 28
+    timetuple = dt.timetuple()
+    s1 = ttime.strftime(fmt, (year,) + timetuple[1:])
+    sites1 = _findall(s1, str(year))
+
+    s2 = ttime.strftime(fmt, (year + 28,) + timetuple[1:])
+    sites2 = _findall(s2, str(year + 28))
+
+    sites = []
+    for site in sites1:
+        if site in sites2:
+            sites.append(site)
+
+    s = s1
+    syear = "%04d" % (dt.year,)
+    for site in sites:
+        s = s[:site] + syear + s[site + 4:]
+    return s

flex/lib/python3.6/site-packages/django/utils/deconstruct.py

@@ -0,0 +1,55 @@
+from importlib import import_module
+
+from django.utils.version import get_docs_version
+
+
+def deconstructible(*args, path=None):
+    """
+    Class decorator that allows the decorated class to be serialized
+    by the migrations subsystem.
+
+    The `path` kwarg specifies the import path.
+    """
+    def decorator(klass):
+        def __new__(cls, *args, **kwargs):
+            # We capture the arguments to make returning them trivial
+            obj = super(klass, cls).__new__(cls)
+            obj._constructor_args = (args, kwargs)
+            return obj
+
+        def deconstruct(obj):
+            """
+            Return a 3-tuple of class import path, positional arguments,
+            and keyword arguments.
+            """
+            # Fallback version
+            if path:
+                module_name, _, name = path.rpartition('.')
+            else:
+                module_name = obj.__module__
+                name = obj.__class__.__name__
+            # Make sure it's actually there and not an inner class
+            module = import_module(module_name)
+            if not hasattr(module, name):
+                raise ValueError(
+                    "Could not find object %s in %s.\n"
+                    "Please note that you cannot serialize things like inner "
+                    "classes. Please move the object into the main module "
+                    "body to use migrations.\n"
+                    "For more information, see "
+                    "https://docs.djangoproject.com/en/%s/topics/migrations/#serializing-values"
+                    % (name, module_name, get_docs_version()))
+            return (
+                path or '%s.%s' % (obj.__class__.__module__, name),
+                obj._constructor_args[0],
+                obj._constructor_args[1],
+            )
+
+        klass.__new__ = staticmethod(__new__)
+        klass.deconstruct = deconstruct
+
+        return klass
+
+    if not args:
+        return decorator
+    return decorator(*args)

flex/lib/python3.6/site-packages/django/utils/decorators.py

@@ -0,0 +1,176 @@
+"Functions that help with dynamically creating decorators for views."
+
+# For backwards compatibility in Django 2.0.
+from contextlib import ContextDecorator  # noqa
+from functools import WRAPPER_ASSIGNMENTS, update_wrapper, wraps
+
+
+class classonlymethod(classmethod):
+    def __get__(self, instance, cls=None):
+        if instance is not None:
+            raise AttributeError("This method is available only on the class, not on instances.")
+        return super().__get__(instance, cls)
+
+
+def method_decorator(decorator, name=''):
+    """
+    Convert a function decorator into a method decorator
+    """
+    # 'obj' can be a class or a function. If 'obj' is a function at the time it
+    # is passed to _dec,  it will eventually be a method of the class it is
+    # defined on. If 'obj' is a class, the 'name' is required to be the name
+    # of the method that will be decorated.
+    def _dec(obj):
+        is_class = isinstance(obj, type)
+        if is_class:
+            if name and hasattr(obj, name):
+                func = getattr(obj, name)
+                if not callable(func):
+                    raise TypeError(
+                        "Cannot decorate '{0}' as it isn't a callable "
+                        "attribute of {1} ({2})".format(name, obj, func)
+                    )
+            else:
+                raise ValueError(
+                    "The keyword argument `name` must be the name of a method "
+                    "of the decorated class: {0}. Got '{1}' instead".format(
+                        obj, name,
+                    )
+                )
+        else:
+            func = obj
+
+        def decorate(function):
+            """
+            Apply a list/tuple of decorators if decorator is one. Decorator
+            functions are applied so that the call order is the same as the
+            order in which they appear in the iterable.
+            """
+            if hasattr(decorator, '__iter__'):
+                for dec in decorator[::-1]:
+                    function = dec(function)
+                return function
+            return decorator(function)
+
+        def _wrapper(self, *args, **kwargs):
+            @decorate
+            def bound_func(*args2, **kwargs2):
+                return func.__get__(self, type(self))(*args2, **kwargs2)
+            # bound_func has the signature that 'decorator' expects i.e.  no
+            # 'self' argument, but it is a closure over self so it can call
+            # 'func' correctly.
+            return bound_func(*args, **kwargs)
+        # In case 'decorator' adds attributes to the function it decorates, we
+        # want to copy those. We don't have access to bound_func in this scope,
+        # but we can cheat by using it on a dummy function.
+
+        @decorate
+        def dummy(*args, **kwargs):
+            pass
+        update_wrapper(_wrapper, dummy)
+        # Need to preserve any existing attributes of 'func', including the name.
+        update_wrapper(_wrapper, func)
+
+        if is_class:
+            setattr(obj, name, _wrapper)
+            return obj
+
+        return _wrapper
+    # Don't worry about making _dec look similar to a list/tuple as it's rather
+    # meaningless.
+    if not hasattr(decorator, '__iter__'):
+        update_wrapper(_dec, decorator)
+    # Change the name to aid debugging.
+    if hasattr(decorator, '__name__'):
+        _dec.__name__ = 'method_decorator(%s)' % decorator.__name__
+    else:
+        _dec.__name__ = 'method_decorator(%s)' % decorator.__class__.__name__
+    return _dec
+
+
+def decorator_from_middleware_with_args(middleware_class):
+    """
+    Like decorator_from_middleware, but return a function
+    that accepts the arguments to be passed to the middleware_class.
+    Use like::
+
+         cache_page = decorator_from_middleware_with_args(CacheMiddleware)
+         # ...
+
+         @cache_page(3600)
+         def my_view(request):
+             # ...
+    """
+    return make_middleware_decorator(middleware_class)
+
+
+def decorator_from_middleware(middleware_class):
+    """
+    Given a middleware class (not an instance), return a view decorator. This
+    lets you use middleware functionality on a per-view basis. The middleware
+    is created with no params passed.
+    """
+    return make_middleware_decorator(middleware_class)()
+
+
+# Unused, for backwards compatibility in Django 2.0.
+def available_attrs(fn):
+    """
+    Return the list of functools-wrappable attributes on a callable.
+    This was required as a workaround for http://bugs.python.org/issue3445
+    under Python 2.
+    """
+    return WRAPPER_ASSIGNMENTS
+
+
+def make_middleware_decorator(middleware_class):
+    def _make_decorator(*m_args, **m_kwargs):
+        middleware = middleware_class(*m_args, **m_kwargs)
+
+        def _decorator(view_func):
+            @wraps(view_func)
+            def _wrapped_view(request, *args, **kwargs):
+                if hasattr(middleware, 'process_request'):
+                    result = middleware.process_request(request)
+                    if result is not None:
+                        return result
+                if hasattr(middleware, 'process_view'):
+                    result = middleware.process_view(request, view_func, args, kwargs)
+                    if result is not None:
+                        return result
+                try:
+                    response = view_func(request, *args, **kwargs)
+                except Exception as e:
+                    if hasattr(middleware, 'process_exception'):
+                        result = middleware.process_exception(request, e)
+                        if result is not None:
+                            return result
+                    raise
+                if hasattr(response, 'render') and callable(response.render):
+                    if hasattr(middleware, 'process_template_response'):
+                        response = middleware.process_template_response(request, response)
+                    # Defer running of process_response until after the template
+                    # has been rendered:
+                    if hasattr(middleware, 'process_response'):
+                        def callback(response):
+                            return middleware.process_response(request, response)
+                        response.add_post_render_callback(callback)
+                else:
+                    if hasattr(middleware, 'process_response'):
+                        return middleware.process_response(request, response)
+                return response
+            return _wrapped_view
+        return _decorator
+    return _make_decorator
+
+
+class classproperty:
+    def __init__(self, method=None):
+        self.fget = method
+
+    def __get__(self, instance, cls=None):
+        return self.fget(cls)
+
+    def getter(self, method):
+        self.fget = method
+        return self

flex/lib/python3.6/site-packages/django/utils/deprecation.py

@@ -0,0 +1,98 @@
+import inspect
+import warnings
+
+
+class RemovedInDjango30Warning(PendingDeprecationWarning):
+    pass
+
+
+class RemovedInDjango21Warning(DeprecationWarning):
+    pass
+
+
+RemovedInNextVersionWarning = RemovedInDjango21Warning
+
+
+class warn_about_renamed_method:
+    def __init__(self, class_name, old_method_name, new_method_name, deprecation_warning):
+        self.class_name = class_name
+        self.old_method_name = old_method_name
+        self.new_method_name = new_method_name
+        self.deprecation_warning = deprecation_warning
+
+    def __call__(self, f):
+        def wrapped(*args, **kwargs):
+            warnings.warn(
+                "`%s.%s` is deprecated, use `%s` instead." %
+                (self.class_name, self.old_method_name, self.new_method_name),
+                self.deprecation_warning, 2)
+            return f(*args, **kwargs)
+        return wrapped
+
+
+class RenameMethodsBase(type):
+    """
+    Handles the deprecation paths when renaming a method.
+
+    It does the following:
+        1) Define the new method if missing and complain about it.
+        2) Define the old method if missing.
+        3) Complain whenever an old method is called.
+
+    See #15363 for more details.
+    """
+
+    renamed_methods = ()
+
+    def __new__(cls, name, bases, attrs):
+        new_class = super().__new__(cls, name, bases, attrs)
+
+        for base in inspect.getmro(new_class):
+            class_name = base.__name__
+            for renamed_method in cls.renamed_methods:
+                old_method_name = renamed_method[0]
+                old_method = base.__dict__.get(old_method_name)
+                new_method_name = renamed_method[1]
+                new_method = base.__dict__.get(new_method_name)
+                deprecation_warning = renamed_method[2]
+                wrapper = warn_about_renamed_method(class_name, *renamed_method)
+
+                # Define the new method if missing and complain about it
+                if not new_method and old_method:
+                    warnings.warn(
+                        "`%s.%s` method should be renamed `%s`." %
+                        (class_name, old_method_name, new_method_name),
+                        deprecation_warning, 2)
+                    setattr(base, new_method_name, old_method)
+                    setattr(base, old_method_name, wrapper(old_method))
+
+                # Define the old method as a wrapped call to the new method.
+                if not old_method and new_method:
+                    setattr(base, old_method_name, wrapper(new_method))
+
+        return new_class
+
+
+class DeprecationInstanceCheck(type):
+    def __instancecheck__(self, instance):
+        warnings.warn(
+            "`%s` is deprecated, use `%s` instead." % (self.__name__, self.alternative),
+            self.deprecation_warning, 2
+        )
+        return super().__instancecheck__(instance)
+
+
+class MiddlewareMixin:
+    def __init__(self, get_response=None):
+        self.get_response = get_response
+        super().__init__()
+
+    def __call__(self, request):
+        response = None
+        if hasattr(self, 'process_request'):
+            response = self.process_request(request)
+        if not response:
+            response = self.get_response(request)
+        if hasattr(self, 'process_response'):
+            response = self.process_response(request, response)
+        return response

flex/lib/python3.6/site-packages/django/utils/duration.py

@@ -0,0 +1,40 @@
+import datetime
+
+
+def _get_duration_components(duration):
+    days = duration.days
+    seconds = duration.seconds
+    microseconds = duration.microseconds
+
+    minutes = seconds // 60
+    seconds = seconds % 60
+
+    hours = minutes // 60
+    minutes = minutes % 60
+
+    return days, hours, minutes, seconds, microseconds
+
+
+def duration_string(duration):
+    """Version of str(timedelta) which is not English specific."""
+    days, hours, minutes, seconds, microseconds = _get_duration_components(duration)
+
+    string = '{:02d}:{:02d}:{:02d}'.format(hours, minutes, seconds)
+    if days:
+        string = '{} '.format(days) + string
+    if microseconds:
+        string += '.{:06d}'.format(microseconds)
+
+    return string
+
+
+def duration_iso_string(duration):
+    if duration < datetime.timedelta(0):
+        sign = '-'
+        duration *= -1
+    else:
+        sign = ''
+
+    days, hours, minutes, seconds, microseconds = _get_duration_components(duration)
+    ms = '.{:06d}'.format(microseconds) if microseconds else ""
+    return '{}P{}DT{:02d}H{:02d}M{:02d}{}S'.format(sign, days, hours, minutes, seconds, ms)

flex/lib/python3.6/site-packages/django/utils/encoding.py

@@ -0,0 +1,269 @@
+import codecs
+import datetime
+import locale
+from decimal import Decimal
+from urllib.parse import quote
+
+from django.utils import six
+from django.utils.functional import Promise
+
+
+class DjangoUnicodeDecodeError(UnicodeDecodeError):
+    def __init__(self, obj, *args):
+        self.obj = obj
+        super().__init__(*args)
+
+    def __str__(self):
+        return '%s. You passed in %r (%s)' % (super().__str__(), self.obj, type(self.obj))
+
+
+# For backwards compatibility. (originally in Django, then added to six 1.9)
+python_2_unicode_compatible = six.python_2_unicode_compatible
+
+
+def smart_text(s, encoding='utf-8', strings_only=False, errors='strict'):
+    """
+    Return a string representing 's'. Treat bytestrings using the 'encoding'
+    codec.
+
+    If strings_only is True, don't convert (some) non-string-like objects.
+    """
+    if isinstance(s, Promise):
+        # The input is the result of a gettext_lazy() call.
+        return s
+    return force_text(s, encoding, strings_only, errors)
+
+
+_PROTECTED_TYPES = (
+    type(None), int, float, Decimal, datetime.datetime, datetime.date, datetime.time,
+)
+
+
+def is_protected_type(obj):
+    """Determine if the object instance is of a protected type.
+
+    Objects of protected types are preserved as-is when passed to
+    force_text(strings_only=True).
+    """
+    return isinstance(obj, _PROTECTED_TYPES)
+
+
+def force_text(s, encoding='utf-8', strings_only=False, errors='strict'):
+    """
+    Similar to smart_text, except that lazy instances are resolved to
+    strings, rather than kept as lazy objects.
+
+    If strings_only is True, don't convert (some) non-string-like objects.
+    """
+    # Handle the common case first for performance reasons.
+    if issubclass(type(s), str):
+        return s
+    if strings_only and is_protected_type(s):
+        return s
+    try:
+        if isinstance(s, bytes):
+            s = str(s, encoding, errors)
+        else:
+            s = str(s)
+    except UnicodeDecodeError as e:
+        raise DjangoUnicodeDecodeError(s, *e.args)
+    return s
+
+
+def smart_bytes(s, encoding='utf-8', strings_only=False, errors='strict'):
+    """
+    Return a bytestring version of 's', encoded as specified in 'encoding'.
+
+    If strings_only is True, don't convert (some) non-string-like objects.
+    """
+    if isinstance(s, Promise):
+        # The input is the result of a gettext_lazy() call.
+        return s
+    return force_bytes(s, encoding, strings_only, errors)
+
+
+def force_bytes(s, encoding='utf-8', strings_only=False, errors='strict'):
+    """
+    Similar to smart_bytes, except that lazy instances are resolved to
+    strings, rather than kept as lazy objects.
+
+    If strings_only is True, don't convert (some) non-string-like objects.
+    """
+    # Handle the common case first for performance reasons.
+    if isinstance(s, bytes):
+        if encoding == 'utf-8':
+            return s
+        else:
+            return s.decode('utf-8', errors).encode(encoding, errors)
+    if strings_only and is_protected_type(s):
+        return s
+    if isinstance(s, memoryview):
+        return bytes(s)
+    if isinstance(s, Promise) or not isinstance(s, str):
+        return str(s).encode(encoding, errors)
+    else:
+        return s.encode(encoding, errors)
+
+
+smart_str = smart_text
+force_str = force_text
+
+smart_str.__doc__ = """
+Apply smart_text in Python 3 and smart_bytes in Python 2.
+
+This is suitable for writing to sys.stdout (for instance).
+"""
+
+force_str.__doc__ = """
+Apply force_text in Python 3 and force_bytes in Python 2.
+"""
+
+
+def iri_to_uri(iri):
+    """
+    Convert an Internationalized Resource Identifier (IRI) portion to a URI
+    portion that is suitable for inclusion in a URL.
+
+    This is the algorithm from section 3.1 of RFC 3987, slightly simplified
+    since the input is assumed to be a string rather than an arbitrary byte
+    stream.
+
+    Take an IRI (string or UTF-8 bytes, e.g. '/I ♥ Django/' or
+    b'/I \xe2\x99\xa5 Django/') and return a string containing the encoded
+    result with ASCII chars only (e.g. '/I%20%E2%99%A5%20Django/').
+    """
+    # The list of safe characters here is constructed from the "reserved" and
+    # "unreserved" characters specified in sections 2.2 and 2.3 of RFC 3986:
+    #     reserved    = gen-delims / sub-delims
+    #     gen-delims  = ":" / "/" / "?" / "#" / "[" / "]" / "@"
+    #     sub-delims  = "!" / "$" / "&" / "'" / "(" / ")"
+    #                   / "*" / "+" / "," / ";" / "="
+    #     unreserved  = ALPHA / DIGIT / "-" / "." / "_" / "~"
+    # Of the unreserved characters, urllib.parse.quote() already considers all
+    # but the ~ safe.
+    # The % character is also added to the list of safe characters here, as the
+    # end of section 3.1 of RFC 3987 specifically mentions that % must not be
+    # converted.
+    if iri is None:
+        return iri
+    elif isinstance(iri, Promise):
+        iri = str(iri)
+    return quote(iri, safe="/#%[]=:;$&()+,!?*@'~")
+
+
+# List of byte values that uri_to_iri() decodes from percent encoding.
+# First, the unreserved characters from RFC 3986:
+_ascii_ranges = [[45, 46, 95, 126], range(65, 91), range(97, 123)]
+_hextobyte = {
+    (fmt % char).encode(): bytes((char,))
+    for ascii_range in _ascii_ranges
+    for char in ascii_range
+    for fmt in ['%02x', '%02X']
+}
+# And then everything above 128, because bytes ≥ 128 are part of multibyte
+# unicode characters.
+_hexdig = '0123456789ABCDEFabcdef'
+_hextobyte.update({
+    (a + b).encode(): bytes.fromhex(a + b)
+    for a in _hexdig[8:] for b in _hexdig
+})
+
+
+def uri_to_iri(uri):
+    """
+    Convert a Uniform Resource Identifier(URI) into an Internationalized
+    Resource Identifier(IRI).
+
+    This is the algorithm from section 3.2 of RFC 3987, excluding step 4.
+
+    Take an URI in ASCII bytes (e.g. '/I%20%E2%99%A5%20Django/') and return
+    a string containing the encoded result (e.g. '/I%20♥%20Django/').
+    """
+    if uri is None:
+        return uri
+    uri = force_bytes(uri)
+    # Fast selective unqote: First, split on '%' and then starting with the
+    # second block, decode the first 2 bytes if they represent a hex code to
+    # decode. The rest of the block is the part after '%AB', not containing
+    # any '%'. Add that to the output without further processing.
+    bits = uri.split(b'%')
+    if len(bits) == 1:
+        iri = uri
+    else:
+        parts = [bits[0]]
+        append = parts.append
+        hextobyte = _hextobyte
+        for item in bits[1:]:
+            hex = item[:2]
+            if hex in hextobyte:
+                append(hextobyte[item[:2]])
+                append(item[2:])
+            else:
+                append(b'%')
+                append(item)
+        iri = b''.join(parts)
+    return repercent_broken_unicode(iri).decode()
+
+
+def escape_uri_path(path):
+    """
+    Escape the unsafe characters from the path portion of a Uniform Resource
+    Identifier (URI).
+    """
+    # These are the "reserved" and "unreserved" characters specified in
+    # sections 2.2 and 2.3 of RFC 2396:
+    #   reserved    = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" | "$" | ","
+    #   unreserved  = alphanum | mark
+    #   mark        = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")"
+    # The list of safe characters here is constructed subtracting ";", "=",
+    # and "?" according to section 3.3 of RFC 2396.
+    # The reason for not subtracting and escaping "/" is that we are escaping
+    # the entire path, not a path segment.
+    return quote(path, safe="/:@&+$,-_.!~*'()")
+
+
+def repercent_broken_unicode(path):
+    """
+    As per section 3.2 of RFC 3987, step three of converting a URI into an IRI,
+    repercent-encode any octet produced that is not part of a strictly legal
+    UTF-8 octet sequence.
+    """
+    try:
+        path.decode()
+    except UnicodeDecodeError as e:
+        repercent = quote(path[e.start:e.end], safe=b"/#%[]=:;$&()+,!?*@'~")
+        path = repercent_broken_unicode(
+            path[:e.start] + force_bytes(repercent) + path[e.end:])
+    return path
+
+
+def filepath_to_uri(path):
+    """Convert a file system path to a URI portion that is suitable for
+    inclusion in a URL.
+
+    Encode certain chars that would normally be recognized as special chars
+    for URIs. Do not encode the ' character, as it is a valid character
+    within URIs. See the encodeURIComponent() JavaScript function for details.
+    """
+    if path is None:
+        return path
+    # I know about `os.sep` and `os.altsep` but I want to leave
+    # some flexibility for hardcoding separators.
+    return quote(path.replace("\\", "/"), safe="/~!*()'")
+
+
+def get_system_encoding():
+    """
+    The encoding of the default system locale. Fallback to 'ascii' if the
+    #encoding is unsupported by Python or could not be determined. See tickets
+    #10335 and #5846.
+    """
+    try:
+        encoding = locale.getdefaultlocale()[1] or 'ascii'
+        codecs.lookup(encoding)
+    except Exception:
+        encoding = 'ascii'
+    return encoding
+
+
+DEFAULT_LOCALE_ENCODING = get_system_encoding()

flex/lib/python3.6/site-packages/django/utils/feedgenerator.py

@@ -0,0 +1,416 @@
+"""
+Syndication feed generation library -- used for generating RSS, etc.
+
+Sample usage:
+
+>>> from django.utils import feedgenerator
+>>> feed = feedgenerator.Rss201rev2Feed(
+...     title="Poynter E-Media Tidbits",
+...     link="http://www.poynter.org/column.asp?id=31",
+...     description="A group Weblog by the sharpest minds in online media/journalism/publishing.",
+...     language="en",
+... )
+>>> feed.add_item(
+...     title="Hello",
+...     link="http://www.holovaty.com/test/",
+...     description="Testing."
+... )
+>>> with open('test.rss', 'w') as fp:
+...     feed.write(fp, 'utf-8')
+
+For definitions of the different versions of RSS, see:
+http://web.archive.org/web/20110718035220/http://diveintomark.org/archives/2004/02/04/incompatible-rss
+"""
+import datetime
+from io import StringIO
+from urllib.parse import urlparse
+
+from django.utils import datetime_safe
+from django.utils.encoding import iri_to_uri
+from django.utils.timezone import utc
+from django.utils.xmlutils import SimplerXMLGenerator
+
+
+def rfc2822_date(date):
+    # We can't use strftime() because it produces locale-dependent results, so
+    # we have to map english month and day names manually
+    months = ('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec',)
+    days = ('Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun')
+    # Support datetime objects older than 1900
+    date = datetime_safe.new_datetime(date)
+    # Timezone aware formatting. email.utils.formatdate() isn't tz aware.
+    dow = days[date.weekday()]
+    month = months[date.month - 1]
+    time_str = date.strftime('%s, %%d %s %%Y %%H:%%M:%%S ' % (dow, month))
+    offset = date.utcoffset()
+    # Historically, this function assumes that naive datetimes are in UTC.
+    if offset is None:
+        return time_str + '-0000'
+    else:
+        timezone = (offset.days * 24 * 60) + (offset.seconds // 60)
+        hour, minute = divmod(timezone, 60)
+        return time_str + '%+03d%02d' % (hour, minute)
+
+
+def rfc3339_date(date):
+    # Support datetime objects older than 1900
+    date = datetime_safe.new_datetime(date)
+    time_str = date.strftime('%Y-%m-%dT%H:%M:%S')
+    offset = date.utcoffset()
+    # Historically, this function assumes that naive datetimes are in UTC.
+    if offset is None:
+        return time_str + 'Z'
+    else:
+        timezone = (offset.days * 24 * 60) + (offset.seconds // 60)
+        hour, minute = divmod(timezone, 60)
+        return time_str + '%+03d:%02d' % (hour, minute)
+
+
+def get_tag_uri(url, date):
+    """
+    Create a TagURI.
+
+    See http://web.archive.org/web/20110514113830/http://diveintomark.org/archives/2004/05/28/howto-atom-id
+    """
+    bits = urlparse(url)
+    d = ''
+    if date is not None:
+        d = ',%s' % datetime_safe.new_datetime(date).strftime('%Y-%m-%d')
+    return 'tag:%s%s:%s/%s' % (bits.hostname, d, bits.path, bits.fragment)
+
+
+class SyndicationFeed:
+    "Base class for all syndication feeds. Subclasses should provide write()"
+    def __init__(self, title, link, description, language=None, author_email=None,
+                 author_name=None, author_link=None, subtitle=None, categories=None,
+                 feed_url=None, feed_copyright=None, feed_guid=None, ttl=None, **kwargs):
+        def to_str(s):
+            return str(s) if s is not None else s
+        if categories:
+            categories = [str(c) for c in categories]
+        self.feed = {
+            'title': to_str(title),
+            'link': iri_to_uri(link),
+            'description': to_str(description),
+            'language': to_str(language),
+            'author_email': to_str(author_email),
+            'author_name': to_str(author_name),
+            'author_link': iri_to_uri(author_link),
+            'subtitle': to_str(subtitle),
+            'categories': categories or (),
+            'feed_url': iri_to_uri(feed_url),
+            'feed_copyright': to_str(feed_copyright),
+            'id': feed_guid or link,
+            'ttl': to_str(ttl),
+        }
+        self.feed.update(kwargs)
+        self.items = []
+
+    def add_item(self, title, link, description, author_email=None,
+                 author_name=None, author_link=None, pubdate=None, comments=None,
+                 unique_id=None, unique_id_is_permalink=None, categories=(),
+                 item_copyright=None, ttl=None, updateddate=None, enclosures=None, **kwargs):
+        """
+        Add an item to the feed. All args are expected to be strings except
+        pubdate and updateddate, which are datetime.datetime objects, and
+        enclosures, which is an iterable of instances of the Enclosure class.
+        """
+        def to_str(s):
+            return str(s) if s is not None else s
+        if categories:
+            categories = [to_str(c) for c in categories]
+        item = {
+            'title': to_str(title),
+            'link': iri_to_uri(link),
+            'description': to_str(description),
+            'author_email': to_str(author_email),
+            'author_name': to_str(author_name),
+            'author_link': iri_to_uri(author_link),
+            'pubdate': pubdate,
+            'updateddate': updateddate,
+            'comments': to_str(comments),
+            'unique_id': to_str(unique_id),
+            'unique_id_is_permalink': unique_id_is_permalink,
+            'enclosures': enclosures or (),
+            'categories': categories or (),
+            'item_copyright': to_str(item_copyright),
+            'ttl': to_str(ttl),
+        }
+        item.update(kwargs)
+        self.items.append(item)
+
+    def num_items(self):
+        return len(self.items)
+
+    def root_attributes(self):
+        """
+        Return extra attributes to place on the root (i.e. feed/channel) element.
+        Called from write().
+        """
+        return {}
+
+    def add_root_elements(self, handler):
+        """
+        Add elements in the root (i.e. feed/channel) element. Called
+        from write().
+        """
+        pass
+
+    def item_attributes(self, item):
+        """
+        Return extra attributes to place on each item (i.e. item/entry) element.
+        """
+        return {}
+
+    def add_item_elements(self, handler, item):
+        """
+        Add elements on each item (i.e. item/entry) element.
+        """
+        pass
+
+    def write(self, outfile, encoding):
+        """
+        Output the feed in the given encoding to outfile, which is a file-like
+        object. Subclasses should override this.
+        """
+        raise NotImplementedError('subclasses of SyndicationFeed must provide a write() method')
+
+    def writeString(self, encoding):
+        """
+        Return the feed in the given encoding as a string.
+        """
+        s = StringIO()
+        self.write(s, encoding)
+        return s.getvalue()
+
+    def latest_post_date(self):
+        """
+        Return the latest item's pubdate or updateddate. If no items
+        have either of these attributes this return the current UTC date/time.
+        """
+        latest_date = None
+        date_keys = ('updateddate', 'pubdate')
+
+        for item in self.items:
+            for date_key in date_keys:
+                item_date = item.get(date_key)
+                if item_date:
+                    if latest_date is None or item_date > latest_date:
+                        latest_date = item_date
+
+        # datetime.now(tz=utc) is slower, as documented in django.utils.timezone.now
+        return latest_date or datetime.datetime.utcnow().replace(tzinfo=utc)
+
+
+class Enclosure:
+    """An RSS enclosure"""
+    def __init__(self, url, length, mime_type):
+        "All args are expected to be strings"
+        self.length, self.mime_type = length, mime_type
+        self.url = iri_to_uri(url)
+
+
+class RssFeed(SyndicationFeed):
+    content_type = 'application/rss+xml; charset=utf-8'
+
+    def write(self, outfile, encoding):
+        handler = SimplerXMLGenerator(outfile, encoding)
+        handler.startDocument()
+        handler.startElement("rss", self.rss_attributes())
+        handler.startElement("channel", self.root_attributes())
+        self.add_root_elements(handler)
+        self.write_items(handler)
+        self.endChannelElement(handler)
+        handler.endElement("rss")
+
+    def rss_attributes(self):
+        return {"version": self._version,
+                "xmlns:atom": "http://www.w3.org/2005/Atom"}
+
+    def write_items(self, handler):
+        for item in self.items:
+            handler.startElement('item', self.item_attributes(item))
+            self.add_item_elements(handler, item)
+            handler.endElement("item")
+
+    def add_root_elements(self, handler):
+        handler.addQuickElement("title", self.feed['title'])
+        handler.addQuickElement("link", self.feed['link'])
+        handler.addQuickElement("description", self.feed['description'])
+        if self.feed['feed_url'] is not None:
+            handler.addQuickElement("atom:link", None, {"rel": "self", "href": self.feed['feed_url']})
+        if self.feed['language'] is not None:
+            handler.addQuickElement("language", self.feed['language'])
+        for cat in self.feed['categories']:
+            handler.addQuickElement("category", cat)
+        if self.feed['feed_copyright'] is not None:
+            handler.addQuickElement("copyright", self.feed['feed_copyright'])
+        handler.addQuickElement("lastBuildDate", rfc2822_date(self.latest_post_date()))
+        if self.feed['ttl'] is not None:
+            handler.addQuickElement("ttl", self.feed['ttl'])
+
+    def endChannelElement(self, handler):
+        handler.endElement("channel")
+
+
+class RssUserland091Feed(RssFeed):
+    _version = "0.91"
+
+    def add_item_elements(self, handler, item):
+        handler.addQuickElement("title", item['title'])
+        handler.addQuickElement("link", item['link'])
+        if item['description'] is not None:
+            handler.addQuickElement("description", item['description'])
+
+
+class Rss201rev2Feed(RssFeed):
+    # Spec: http://blogs.law.harvard.edu/tech/rss
+    _version = "2.0"
+
+    def add_item_elements(self, handler, item):
+        handler.addQuickElement("title", item['title'])
+        handler.addQuickElement("link", item['link'])
+        if item['description'] is not None:
+            handler.addQuickElement("description", item['description'])
+
+        # Author information.
+        if item["author_name"] and item["author_email"]:
+            handler.addQuickElement("author", "%s (%s)" % (item['author_email'], item['author_name']))
+        elif item["author_email"]:
+            handler.addQuickElement("author", item["author_email"])
+        elif item["author_name"]:
+            handler.addQuickElement(
+                "dc:creator", item["author_name"], {"xmlns:dc": "http://purl.org/dc/elements/1.1/"}
+            )
+
+        if item['pubdate'] is not None:
+            handler.addQuickElement("pubDate", rfc2822_date(item['pubdate']))
+        if item['comments'] is not None:
+            handler.addQuickElement("comments", item['comments'])
+        if item['unique_id'] is not None:
+            guid_attrs = {}
+            if isinstance(item.get('unique_id_is_permalink'), bool):
+                guid_attrs['isPermaLink'] = str(item['unique_id_is_permalink']).lower()
+            handler.addQuickElement("guid", item['unique_id'], guid_attrs)
+        if item['ttl'] is not None:
+            handler.addQuickElement("ttl", item['ttl'])
+
+        # Enclosure.
+        if item['enclosures']:
+            enclosures = list(item['enclosures'])
+            if len(enclosures) > 1:
+                raise ValueError(
+                    "RSS feed items may only have one enclosure, see "
+                    "http://www.rssboard.org/rss-profile#element-channel-item-enclosure"
+                )
+            enclosure = enclosures[0]
+            handler.addQuickElement('enclosure', '', {
+                'url': enclosure.url,
+                'length': enclosure.length,
+                'type': enclosure.mime_type,
+            })
+
+        # Categories.
+        for cat in item['categories']:
+            handler.addQuickElement("category", cat)
+
+
+class Atom1Feed(SyndicationFeed):
+    # Spec: https://tools.ietf.org/html/rfc4287
+    content_type = 'application/atom+xml; charset=utf-8'
+    ns = "http://www.w3.org/2005/Atom"
+
+    def write(self, outfile, encoding):
+        handler = SimplerXMLGenerator(outfile, encoding)
+        handler.startDocument()
+        handler.startElement('feed', self.root_attributes())
+        self.add_root_elements(handler)
+        self.write_items(handler)
+        handler.endElement("feed")
+
+    def root_attributes(self):
+        if self.feed['language'] is not None:
+            return {"xmlns": self.ns, "xml:lang": self.feed['language']}
+        else:
+            return {"xmlns": self.ns}
+
+    def add_root_elements(self, handler):
+        handler.addQuickElement("title", self.feed['title'])
+        handler.addQuickElement("link", "", {"rel": "alternate", "href": self.feed['link']})
+        if self.feed['feed_url'] is not None:
+            handler.addQuickElement("link", "", {"rel": "self", "href": self.feed['feed_url']})
+        handler.addQuickElement("id", self.feed['id'])
+        handler.addQuickElement("updated", rfc3339_date(self.latest_post_date()))
+        if self.feed['author_name'] is not None:
+            handler.startElement("author", {})
+            handler.addQuickElement("name", self.feed['author_name'])
+            if self.feed['author_email'] is not None:
+                handler.addQuickElement("email", self.feed['author_email'])
+            if self.feed['author_link'] is not None:
+                handler.addQuickElement("uri", self.feed['author_link'])
+            handler.endElement("author")
+        if self.feed['subtitle'] is not None:
+            handler.addQuickElement("subtitle", self.feed['subtitle'])
+        for cat in self.feed['categories']:
+            handler.addQuickElement("category", "", {"term": cat})
+        if self.feed['feed_copyright'] is not None:
+            handler.addQuickElement("rights", self.feed['feed_copyright'])
+
+    def write_items(self, handler):
+        for item in self.items:
+            handler.startElement("entry", self.item_attributes(item))
+            self.add_item_elements(handler, item)
+            handler.endElement("entry")
+
+    def add_item_elements(self, handler, item):
+        handler.addQuickElement("title", item['title'])
+        handler.addQuickElement("link", "", {"href": item['link'], "rel": "alternate"})
+
+        if item['pubdate'] is not None:
+            handler.addQuickElement('published', rfc3339_date(item['pubdate']))
+
+        if item['updateddate'] is not None:
+            handler.addQuickElement('updated', rfc3339_date(item['updateddate']))
+
+        # Author information.
+        if item['author_name'] is not None:
+            handler.startElement("author", {})
+            handler.addQuickElement("name", item['author_name'])
+            if item['author_email'] is not None:
+                handler.addQuickElement("email", item['author_email'])
+            if item['author_link'] is not None:
+                handler.addQuickElement("uri", item['author_link'])
+            handler.endElement("author")
+
+        # Unique ID.
+        if item['unique_id'] is not None:
+            unique_id = item['unique_id']
+        else:
+            unique_id = get_tag_uri(item['link'], item['pubdate'])
+        handler.addQuickElement("id", unique_id)
+
+        # Summary.
+        if item['description'] is not None:
+            handler.addQuickElement("summary", item['description'], {"type": "html"})
+
+        # Enclosures.
+        for enclosure in item['enclosures']:
+            handler.addQuickElement('link', '', {
+                'rel': 'enclosure',
+                'href': enclosure.url,
+                'length': enclosure.length,
+                'type': enclosure.mime_type,
+            })
+
+        # Categories.
+        for cat in item['categories']:
+            handler.addQuickElement("category", "", {"term": cat})
+
+        # Rights.
+        if item['item_copyright'] is not None:
+            handler.addQuickElement("rights", item['item_copyright'])
+
+
+# This isolates the decision of what the system default is, so calling code can
+# do "feedgenerator.DefaultFeed" instead of "feedgenerator.Rss201rev2Feed".
+DefaultFeed = Rss201rev2Feed

flex/lib/python3.6/site-packages/django/utils/formats.py

@@ -0,0 +1,256 @@
+import datetime
+import decimal
+import unicodedata
+from importlib import import_module
+
+from django.conf import settings
+from django.utils import dateformat, datetime_safe, numberformat
+from django.utils.functional import lazy
+from django.utils.translation import (
+    check_for_language, get_language, to_locale,
+)
+
+# format_cache is a mapping from (format_type, lang) to the format string.
+# By using the cache, it is possible to avoid running get_format_modules
+# repeatedly.
+_format_cache = {}
+_format_modules_cache = {}
+
+ISO_INPUT_FORMATS = {
+    'DATE_INPUT_FORMATS': ['%Y-%m-%d'],
+    'TIME_INPUT_FORMATS': ['%H:%M:%S', '%H:%M:%S.%f', '%H:%M'],
+    'DATETIME_INPUT_FORMATS': [
+        '%Y-%m-%d %H:%M:%S',
+        '%Y-%m-%d %H:%M:%S.%f',
+        '%Y-%m-%d %H:%M',
+        '%Y-%m-%d'
+    ],
+}
+
+
+FORMAT_SETTINGS = frozenset([
+    'DECIMAL_SEPARATOR',
+    'THOUSAND_SEPARATOR',
+    'NUMBER_GROUPING',
+    'FIRST_DAY_OF_WEEK',
+    'MONTH_DAY_FORMAT',
+    'TIME_FORMAT',
+    'DATE_FORMAT',
+    'DATETIME_FORMAT',
+    'SHORT_DATE_FORMAT',
+    'SHORT_DATETIME_FORMAT',
+    'YEAR_MONTH_FORMAT',
+    'DATE_INPUT_FORMATS',
+    'TIME_INPUT_FORMATS',
+    'DATETIME_INPUT_FORMATS',
+])
+
+
+def reset_format_cache():
+    """Clear any cached formats.
+
+    This method is provided primarily for testing purposes,
+    so that the effects of cached formats can be removed.
+    """
+    global _format_cache, _format_modules_cache
+    _format_cache = {}
+    _format_modules_cache = {}
+
+
+def iter_format_modules(lang, format_module_path=None):
+    """Find format modules."""
+    if not check_for_language(lang):
+        return
+
+    if format_module_path is None:
+        format_module_path = settings.FORMAT_MODULE_PATH
+
+    format_locations = []
+    if format_module_path:
+        if isinstance(format_module_path, str):
+            format_module_path = [format_module_path]
+        for path in format_module_path:
+            format_locations.append(path + '.%s')
+    format_locations.append('django.conf.locale.%s')
+    locale = to_locale(lang)
+    locales = [locale]
+    if '_' in locale:
+        locales.append(locale.split('_')[0])
+    for location in format_locations:
+        for loc in locales:
+            try:
+                yield import_module('%s.formats' % (location % loc))
+            except ImportError:
+                pass
+
+
+def get_format_modules(lang=None, reverse=False):
+    """Return a list of the format modules found."""
+    if lang is None:
+        lang = get_language()
+    if lang not in _format_modules_cache:
+        _format_modules_cache[lang] = list(iter_format_modules(lang, settings.FORMAT_MODULE_PATH))
+    modules = _format_modules_cache[lang]
+    if reverse:
+        return list(reversed(modules))
+    return modules
+
+
+def get_format(format_type, lang=None, use_l10n=None):
+    """
+    For a specific format type, return the format for the current
+    language (locale). Default to the format in the settings.
+    format_type is the name of the format, e.g. 'DATE_FORMAT'.
+
+    If use_l10n is provided and is not None, it forces the value to
+    be localized (or not), overriding the value of settings.USE_L10N.
+    """
+    use_l10n = use_l10n or (use_l10n is None and settings.USE_L10N)
+    if use_l10n and lang is None:
+        lang = get_language()
+    cache_key = (format_type, lang)
+    try:
+        return _format_cache[cache_key]
+    except KeyError:
+        pass
+
+    # The requested format_type has not been cached yet. Try to find it in any
+    # of the format_modules for the given lang if l10n is enabled. If it's not
+    # there or if l10n is disabled, fall back to the project settings.
+    val = None
+    if use_l10n:
+        for module in get_format_modules(lang):
+            val = getattr(module, format_type, None)
+            if val is not None:
+                break
+    if val is None:
+        if format_type not in FORMAT_SETTINGS:
+            return format_type
+        val = getattr(settings, format_type)
+    elif format_type in ISO_INPUT_FORMATS:
+        # If a list of input formats from one of the format_modules was
+        # retrieved, make sure the ISO_INPUT_FORMATS are in this list.
+        val = list(val)
+        for iso_input in ISO_INPUT_FORMATS.get(format_type, ()):
+            if iso_input not in val:
+                val.append(iso_input)
+    _format_cache[cache_key] = val
+    return val
+
+
+get_format_lazy = lazy(get_format, str, list, tuple)
+
+
+def date_format(value, format=None, use_l10n=None):
+    """
+    Format a datetime.date or datetime.datetime object using a
+    localizable format.
+
+    If use_l10n is provided and is not None, that will force the value to
+    be localized (or not), overriding the value of settings.USE_L10N.
+    """
+    return dateformat.format(value, get_format(format or 'DATE_FORMAT', use_l10n=use_l10n))
+
+
+def time_format(value, format=None, use_l10n=None):
+    """
+    Format a datetime.time object using a localizable format.
+
+    If use_l10n is provided and is not None, it forces the value to
+    be localized (or not), overriding the value of settings.USE_L10N.
+    """
+    return dateformat.time_format(value, get_format(format or 'TIME_FORMAT', use_l10n=use_l10n))
+
+
+def number_format(value, decimal_pos=None, use_l10n=None, force_grouping=False):
+    """
+    Format a numeric value using localization settings.
+
+    If use_l10n is provided and is not None, it forces the value to
+    be localized (or not), overriding the value of settings.USE_L10N.
+    """
+    if use_l10n or (use_l10n is None and settings.USE_L10N):
+        lang = get_language()
+    else:
+        lang = None
+    return numberformat.format(
+        value,
+        get_format('DECIMAL_SEPARATOR', lang, use_l10n=use_l10n),
+        decimal_pos,
+        get_format('NUMBER_GROUPING', lang, use_l10n=use_l10n),
+        get_format('THOUSAND_SEPARATOR', lang, use_l10n=use_l10n),
+        force_grouping=force_grouping
+    )
+
+
+def localize(value, use_l10n=None):
+    """
+    Check if value is a localizable type (date, number...) and return it
+    formatted as a string using current locale format.
+
+    If use_l10n is provided and is not None, it forces the value to
+    be localized (or not), overriding the value of settings.USE_L10N.
+    """
+    if isinstance(value, str):  # Handle strings first for performance reasons.
+        return value
+    elif isinstance(value, bool):  # Make sure booleans don't get treated as numbers
+        return str(value)
+    elif isinstance(value, (decimal.Decimal, float, int)):
+        return number_format(value, use_l10n=use_l10n)
+    elif isinstance(value, datetime.datetime):
+        return date_format(value, 'DATETIME_FORMAT', use_l10n=use_l10n)
+    elif isinstance(value, datetime.date):
+        return date_format(value, use_l10n=use_l10n)
+    elif isinstance(value, datetime.time):
+        return time_format(value, 'TIME_FORMAT', use_l10n=use_l10n)
+    return value
+
+
+def localize_input(value, default=None):
+    """
+    Check if an input value is a localizable type and return it
+    formatted with the appropriate formatting string of the current locale.
+    """
+    if isinstance(value, str):  # Handle strings first for performance reasons.
+        return value
+    elif isinstance(value, bool):  # Don't treat booleans as numbers.
+        return str(value)
+    elif isinstance(value, (decimal.Decimal, float, int)):
+        return number_format(value)
+    elif isinstance(value, datetime.datetime):
+        value = datetime_safe.new_datetime(value)
+        format = default or get_format('DATETIME_INPUT_FORMATS')[0]
+        return value.strftime(format)
+    elif isinstance(value, datetime.date):
+        value = datetime_safe.new_date(value)
+        format = default or get_format('DATE_INPUT_FORMATS')[0]
+        return value.strftime(format)
+    elif isinstance(value, datetime.time):
+        format = default or get_format('TIME_INPUT_FORMATS')[0]
+        return value.strftime(format)
+    return value
+
+
+def sanitize_separators(value):
+    """
+    Sanitize a value according to the current decimal and
+    thousand separator setting. Used with form field input.
+    """
+    if isinstance(value, str):
+        parts = []
+        decimal_separator = get_format('DECIMAL_SEPARATOR')
+        if decimal_separator in value:
+            value, decimals = value.split(decimal_separator, 1)
+            parts.append(decimals)
+        if settings.USE_THOUSAND_SEPARATOR:
+            thousand_sep = get_format('THOUSAND_SEPARATOR')
+            if thousand_sep == '.' and value.count('.') == 1 and len(value.split('.')[-1]) != 3:
+                # Special case where we suspect a dot meant decimal separator (see #22171)
+                pass
+            else:
+                for replacement in {
+                        thousand_sep, unicodedata.normalize('NFKD', thousand_sep)}:
+                    value = value.replace(replacement, '')
+        parts.append(value)
+        value = '.'.join(reversed(parts))
+    return value

flex/lib/python3.6/site-packages/django/utils/functional.py

@@ -0,0 +1,390 @@
+import copy
+import operator
+from functools import total_ordering, wraps
+
+
+# You can't trivially replace this with `functools.partial` because this binds
+# to classes and returns bound instances, whereas functools.partial (on
+# CPython) is a type and its instances don't bind.
+def curry(_curried_func, *args, **kwargs):
+    def _curried(*moreargs, **morekwargs):
+        return _curried_func(*(args + moreargs), **dict(kwargs, **morekwargs))
+    return _curried
+
+
+class cached_property:
+    """
+    Decorator that converts a method with a single self argument into a
+    property cached on the instance.
+
+    Optional ``name`` argument allows you to make cached properties of other
+    methods. (e.g.  url = cached_property(get_absolute_url, name='url') )
+    """
+    def __init__(self, func, name=None):
+        self.func = func
+        self.__doc__ = getattr(func, '__doc__')
+        self.name = name or func.__name__
+
+    def __get__(self, instance, cls=None):
+        """
+        Call the function and put the return value in instance.__dict__ so that
+        subsequent attribute access on the instance returns the cached value
+        instead of calling cached_property.__get__().
+        """
+        if instance is None:
+            return self
+        res = instance.__dict__[self.name] = self.func(instance)
+        return res
+
+
+class Promise:
+    """
+    Base class for the proxy class created in the closure of the lazy function.
+    It's used to recognize promises in code.
+    """
+    pass
+
+
+def lazy(func, *resultclasses):
+    """
+    Turn any callable into a lazy evaluated callable. result classes or types
+    is required -- at least one is needed so that the automatic forcing of
+    the lazy evaluation code is triggered. Results are not memoized; the
+    function is evaluated on every access.
+    """
+
+    @total_ordering
+    class __proxy__(Promise):
+        """
+        Encapsulate a function call and act as a proxy for methods that are
+        called on the result of that function. The function is not evaluated
+        until one of the methods on the result is called.
+        """
+        __prepared = False
+
+        def __init__(self, args, kw):
+            self.__args = args
+            self.__kw = kw
+            if not self.__prepared:
+                self.__prepare_class__()
+            self.__prepared = True
+
+        def __reduce__(self):
+            return (
+                _lazy_proxy_unpickle,
+                (func, self.__args, self.__kw) + resultclasses
+            )
+
+        def __repr__(self):
+            return repr(self.__cast())
+
+        @classmethod
+        def __prepare_class__(cls):
+            for resultclass in resultclasses:
+                for type_ in resultclass.mro():
+                    for method_name in type_.__dict__:
+                        # All __promise__ return the same wrapper method, they
+                        # look up the correct implementation when called.
+                        if hasattr(cls, method_name):
+                            continue
+                        meth = cls.__promise__(method_name)
+                        setattr(cls, method_name, meth)
+            cls._delegate_bytes = bytes in resultclasses
+            cls._delegate_text = str in resultclasses
+            assert not (cls._delegate_bytes and cls._delegate_text), (
+                "Cannot call lazy() with both bytes and text return types.")
+            if cls._delegate_text:
+                cls.__str__ = cls.__text_cast
+            elif cls._delegate_bytes:
+                cls.__bytes__ = cls.__bytes_cast
+
+        @classmethod
+        def __promise__(cls, method_name):
+            # Builds a wrapper around some magic method
+            def __wrapper__(self, *args, **kw):
+                # Automatically triggers the evaluation of a lazy value and
+                # applies the given magic method of the result type.
+                res = func(*self.__args, **self.__kw)
+                return getattr(res, method_name)(*args, **kw)
+            return __wrapper__
+
+        def __text_cast(self):
+            return func(*self.__args, **self.__kw)
+
+        def __bytes_cast(self):
+            return bytes(func(*self.__args, **self.__kw))
+
+        def __bytes_cast_encoded(self):
+            return func(*self.__args, **self.__kw).encode()
+
+        def __cast(self):
+            if self._delegate_bytes:
+                return self.__bytes_cast()
+            elif self._delegate_text:
+                return self.__text_cast()
+            else:
+                return func(*self.__args, **self.__kw)
+
+        def __str__(self):
+            # object defines __str__(), so __prepare_class__() won't overload
+            # a __str__() method from the proxied class.
+            return str(self.__cast())
+
+        def __eq__(self, other):
+            if isinstance(other, Promise):
+                other = other.__cast()
+            return self.__cast() == other
+
+        def __lt__(self, other):
+            if isinstance(other, Promise):
+                other = other.__cast()
+            return self.__cast() < other
+
+        def __hash__(self):
+            return hash(self.__cast())
+
+        def __mod__(self, rhs):
+            if self._delegate_text:
+                return str(self) % rhs
+            return self.__cast() % rhs
+
+        def __deepcopy__(self, memo):
+            # Instances of this class are effectively immutable. It's just a
+            # collection of functions. So we don't need to do anything
+            # complicated for copying.
+            memo[id(self)] = self
+            return self
+
+    @wraps(func)
+    def __wrapper__(*args, **kw):
+        # Creates the proxy object, instead of the actual value.
+        return __proxy__(args, kw)
+
+    return __wrapper__
+
+
+def _lazy_proxy_unpickle(func, args, kwargs, *resultclasses):
+    return lazy(func, *resultclasses)(*args, **kwargs)
+
+
+def lazystr(text):
+    """
+    Shortcut for the common case of a lazy callable that returns str.
+    """
+    return lazy(str, str)(text)
+
+
+def keep_lazy(*resultclasses):
+    """
+    A decorator that allows a function to be called with one or more lazy
+    arguments. If none of the args are lazy, the function is evaluated
+    immediately, otherwise a __proxy__ is returned that will evaluate the
+    function when needed.
+    """
+    if not resultclasses:
+        raise TypeError("You must pass at least one argument to keep_lazy().")
+
+    def decorator(func):
+        lazy_func = lazy(func, *resultclasses)
+
+        @wraps(func)
+        def wrapper(*args, **kwargs):
+            for arg in list(args) + list(kwargs.values()):
+                if isinstance(arg, Promise):
+                    break
+            else:
+                return func(*args, **kwargs)
+            return lazy_func(*args, **kwargs)
+        return wrapper
+    return decorator
+
+
+def keep_lazy_text(func):
+    """
+    A decorator for functions that accept lazy arguments and return text.
+    """
+    return keep_lazy(str)(func)
+
+
+empty = object()
+
+
+def new_method_proxy(func):
+    def inner(self, *args):
+        if self._wrapped is empty:
+            self._setup()
+        return func(self._wrapped, *args)
+    return inner
+
+
+class LazyObject:
+    """
+    A wrapper for another class that can be used to delay instantiation of the
+    wrapped class.
+
+    By subclassing, you have the opportunity to intercept and alter the
+    instantiation. If you don't need to do that, use SimpleLazyObject.
+    """
+
+    # Avoid infinite recursion when tracing __init__ (#19456).
+    _wrapped = None
+
+    def __init__(self):
+        # Note: if a subclass overrides __init__(), it will likely need to
+        # override __copy__() and __deepcopy__() as well.
+        self._wrapped = empty
+
+    __getattr__ = new_method_proxy(getattr)
+
+    def __setattr__(self, name, value):
+        if name == "_wrapped":
+            # Assign to __dict__ to avoid infinite __setattr__ loops.
+            self.__dict__["_wrapped"] = value
+        else:
+            if self._wrapped is empty:
+                self._setup()
+            setattr(self._wrapped, name, value)
+
+    def __delattr__(self, name):
+        if name == "_wrapped":
+            raise TypeError("can't delete _wrapped.")
+        if self._wrapped is empty:
+            self._setup()
+        delattr(self._wrapped, name)
+
+    def _setup(self):
+        """
+        Must be implemented by subclasses to initialize the wrapped object.
+        """
+        raise NotImplementedError('subclasses of LazyObject must provide a _setup() method')
+
+    # Because we have messed with __class__ below, we confuse pickle as to what
+    # class we are pickling. We're going to have to initialize the wrapped
+    # object to successfully pickle it, so we might as well just pickle the
+    # wrapped object since they're supposed to act the same way.
+    #
+    # Unfortunately, if we try to simply act like the wrapped object, the ruse
+    # will break down when pickle gets our id(). Thus we end up with pickle
+    # thinking, in effect, that we are a distinct object from the wrapped
+    # object, but with the same __dict__. This can cause problems (see #25389).
+    #
+    # So instead, we define our own __reduce__ method and custom unpickler. We
+    # pickle the wrapped object as the unpickler's argument, so that pickle
+    # will pickle it normally, and then the unpickler simply returns its
+    # argument.
+    def __reduce__(self):
+        if self._wrapped is empty:
+            self._setup()
+        return (unpickle_lazyobject, (self._wrapped,))
+
+    def __copy__(self):
+        if self._wrapped is empty:
+            # If uninitialized, copy the wrapper. Use type(self), not
+            # self.__class__, because the latter is proxied.
+            return type(self)()
+        else:
+            # If initialized, return a copy of the wrapped object.
+            return copy.copy(self._wrapped)
+
+    def __deepcopy__(self, memo):
+        if self._wrapped is empty:
+            # We have to use type(self), not self.__class__, because the
+            # latter is proxied.
+            result = type(self)()
+            memo[id(self)] = result
+            return result
+        return copy.deepcopy(self._wrapped, memo)
+
+    __bytes__ = new_method_proxy(bytes)
+    __str__ = new_method_proxy(str)
+    __bool__ = new_method_proxy(bool)
+
+    # Introspection support
+    __dir__ = new_method_proxy(dir)
+
+    # Need to pretend to be the wrapped class, for the sake of objects that
+    # care about this (especially in equality tests)
+    __class__ = property(new_method_proxy(operator.attrgetter("__class__")))
+    __eq__ = new_method_proxy(operator.eq)
+    __ne__ = new_method_proxy(operator.ne)
+    __hash__ = new_method_proxy(hash)
+
+    # List/Tuple/Dictionary methods support
+    __getitem__ = new_method_proxy(operator.getitem)
+    __setitem__ = new_method_proxy(operator.setitem)
+    __delitem__ = new_method_proxy(operator.delitem)
+    __iter__ = new_method_proxy(iter)
+    __len__ = new_method_proxy(len)
+    __contains__ = new_method_proxy(operator.contains)
+
+
+def unpickle_lazyobject(wrapped):
+    """
+    Used to unpickle lazy objects. Just return its argument, which will be the
+    wrapped object.
+    """
+    return wrapped
+
+
+class SimpleLazyObject(LazyObject):
+    """
+    A lazy object initialized from any function.
+
+    Designed for compound objects of unknown type. For builtins or objects of
+    known type, use django.utils.functional.lazy.
+    """
+    def __init__(self, func):
+        """
+        Pass in a callable that returns the object to be wrapped.
+
+        If copies are made of the resulting SimpleLazyObject, which can happen
+        in various circumstances within Django, then you must ensure that the
+        callable can be safely run more than once and will return the same
+        value.
+        """
+        self.__dict__['_setupfunc'] = func
+        super().__init__()
+
+    def _setup(self):
+        self._wrapped = self._setupfunc()
+
+    # Return a meaningful representation of the lazy object for debugging
+    # without evaluating the wrapped object.
+    def __repr__(self):
+        if self._wrapped is empty:
+            repr_attr = self._setupfunc
+        else:
+            repr_attr = self._wrapped
+        return '<%s: %r>' % (type(self).__name__, repr_attr)
+
+    def __copy__(self):
+        if self._wrapped is empty:
+            # If uninitialized, copy the wrapper. Use SimpleLazyObject, not
+            # self.__class__, because the latter is proxied.
+            return SimpleLazyObject(self._setupfunc)
+        else:
+            # If initialized, return a copy of the wrapped object.
+            return copy.copy(self._wrapped)
+
+    def __deepcopy__(self, memo):
+        if self._wrapped is empty:
+            # We have to use SimpleLazyObject, not self.__class__, because the
+            # latter is proxied.
+            result = SimpleLazyObject(self._setupfunc)
+            memo[id(self)] = result
+            return result
+        return copy.deepcopy(self._wrapped, memo)
+
+
+def partition(predicate, values):
+    """
+    Split the values into two sets, based on the return value of the function
+    (True/False). e.g.:
+
+        >>> partition(lambda x: x > 3, range(5))
+        [0, 1, 2, 3], [4]
+    """
+    results = ([], [])
+    for item in values:
+        results[predicate(item)].append(item)
+    return results

flex/lib/python3.6/site-packages/django/utils/html.py

@@ -0,0 +1,373 @@
+"""HTML utilities suitable for global use."""
+
+import re
+from urllib.parse import (
+    parse_qsl, quote, unquote, urlencode, urlsplit, urlunsplit,
+)
+
+from django.utils.encoding import force_text
+from django.utils.functional import Promise, keep_lazy, keep_lazy_text
+from django.utils.http import RFC3986_GENDELIMS, RFC3986_SUBDELIMS
+from django.utils.safestring import SafeData, SafeText, mark_safe
+from django.utils.text import normalize_newlines
+
+from .html_parser import HTMLParseError, HTMLParser
+
+# Configuration for urlize() function.
+TRAILING_PUNCTUATION_RE = re.compile(
+    '^'           # Beginning of word
+    '(.*?)'       # The URL in word
+    '([.,:;!]+)'  # Allowed non-wrapping, trailing punctuation
+    '$'           # End of word
+)
+WRAPPING_PUNCTUATION = [('(', ')'), ('<', '>'), ('[', ']'), ('&lt;', '&gt;'), ('"', '"'), ('\'', '\'')]
+
+# List of possible strings used for bullets in bulleted lists.
+DOTS = ['&middot;', '*', '\u2022', '&#149;', '&bull;', '&#8226;']
+
+unencoded_ampersands_re = re.compile(r'&(?!(\w+|#\d+);)')
+word_split_re = re.compile(r'''([\s<>"']+)''')
+simple_url_re = re.compile(r'^https?://\[?\w', re.IGNORECASE)
+simple_url_2_re = re.compile(r'^www\.|^(?!http)\w[^@]+\.(com|edu|gov|int|mil|net|org)($|/.*)$', re.IGNORECASE)
+simple_email_re = re.compile(r'^\S+@\S+\.\S+$')
+
+
+@keep_lazy(str, SafeText)
+def escape(text):
+    """
+    Return the given text with ampersands, quotes and angle brackets encoded
+    for use in HTML.
+
+    Always escape input, even if it's already escaped and marked as such.
+    This may result in double-escaping. If this is a concern, use
+    conditional_escape() instead.
+    """
+    return mark_safe(
+        str(text).replace('&', '&amp;').replace('<', '&lt;')
+        .replace('>', '&gt;').replace('"', '&quot;').replace("'", '&#39;')
+    )
+
+
+_js_escapes = {
+    ord('\\'): '\\u005C',
+    ord('\''): '\\u0027',
+    ord('"'): '\\u0022',
+    ord('>'): '\\u003E',
+    ord('<'): '\\u003C',
+    ord('&'): '\\u0026',
+    ord('='): '\\u003D',
+    ord('-'): '\\u002D',
+    ord(';'): '\\u003B',
+    ord('`'): '\\u0060',
+    ord('\u2028'): '\\u2028',
+    ord('\u2029'): '\\u2029'
+}
+
+# Escape every ASCII character with a value less than 32.
+_js_escapes.update((ord('%c' % z), '\\u%04X' % z) for z in range(32))
+
+
+@keep_lazy(str, SafeText)
+def escapejs(value):
+    """Hex encode characters for use in JavaScript strings."""
+    return mark_safe(str(value).translate(_js_escapes))
+
+
+def conditional_escape(text):
+    """
+    Similar to escape(), except that it doesn't operate on pre-escaped strings.
+
+    This function relies on the __html__ convention used both by Django's
+    SafeData class and by third-party libraries like markupsafe.
+    """
+    if isinstance(text, Promise):
+        text = str(text)
+    if hasattr(text, '__html__'):
+        return text.__html__()
+    else:
+        return escape(text)
+
+
+def format_html(format_string, *args, **kwargs):
+    """
+    Similar to str.format, but pass all arguments through conditional_escape(),
+    and call mark_safe() on the result. This function should be used instead
+    of str.format or % interpolation to build up small HTML fragments.
+    """
+    args_safe = map(conditional_escape, args)
+    kwargs_safe = {k: conditional_escape(v) for (k, v) in kwargs.items()}
+    return mark_safe(format_string.format(*args_safe, **kwargs_safe))
+
+
+def format_html_join(sep, format_string, args_generator):
+    """
+    A wrapper of format_html, for the common case of a group of arguments that
+    need to be formatted using the same format string, and then joined using
+    'sep'. 'sep' is also passed through conditional_escape.
+
+    'args_generator' should be an iterator that returns the sequence of 'args'
+    that will be passed to format_html.
+
+    Example:
+
+      format_html_join('\n', "<li>{} {}</li>", ((u.first_name, u.last_name)
+                                                  for u in users))
+    """
+    return mark_safe(conditional_escape(sep).join(
+        format_html(format_string, *tuple(args))
+        for args in args_generator))
+
+
+@keep_lazy_text
+def linebreaks(value, autoescape=False):
+    """Convert newlines into <p> and <br />s."""
+    value = normalize_newlines(value)
+    paras = re.split('\n{2,}', str(value))
+    if autoescape:
+        paras = ['<p>%s</p>' % escape(p).replace('\n', '<br />') for p in paras]
+    else:
+        paras = ['<p>%s</p>' % p.replace('\n', '<br />') for p in paras]
+    return '\n\n'.join(paras)
+
+
+class MLStripper(HTMLParser):
+    def __init__(self):
+        HTMLParser.__init__(self)
+        self.reset()
+        self.fed = []
+
+    def handle_data(self, d):
+        self.fed.append(d)
+
+    def handle_entityref(self, name):
+        self.fed.append('&%s;' % name)
+
+    def handle_charref(self, name):
+        self.fed.append('&#%s;' % name)
+
+    def get_data(self):
+        return ''.join(self.fed)
+
+
+def _strip_once(value):
+    """
+    Internal tag stripping utility used by strip_tags.
+    """
+    s = MLStripper()
+    try:
+        s.feed(value)
+    except HTMLParseError:
+        return value
+    try:
+        s.close()
+    except HTMLParseError:
+        return s.get_data() + s.rawdata
+    else:
+        return s.get_data()
+
+
+@keep_lazy_text
+def strip_tags(value):
+    """Return the given HTML with all tags stripped."""
+    # Note: in typical case this loop executes _strip_once once. Loop condition
+    # is redundant, but helps to reduce number of executions of _strip_once.
+    value = force_text(value)
+    while '<' in value and '>' in value:
+        new_value = _strip_once(value)
+        if len(new_value) >= len(value):
+            # _strip_once was not able to detect more tags
+            break
+        value = new_value
+    return value
+
+
+@keep_lazy_text
+def strip_spaces_between_tags(value):
+    """Return the given HTML with spaces between tags removed."""
+    return re.sub(r'>\s+<', '><', force_text(value))
+
+
+def smart_urlquote(url):
+    """Quote a URL if it isn't already quoted."""
+    def unquote_quote(segment):
+        segment = unquote(segment)
+        # Tilde is part of RFC3986 Unreserved Characters
+        # http://tools.ietf.org/html/rfc3986#section-2.3
+        # See also http://bugs.python.org/issue16285
+        segment = quote(segment, safe=RFC3986_SUBDELIMS + RFC3986_GENDELIMS + '~')
+        return force_text(segment)
+
+    # Handle IDN before quoting.
+    try:
+        scheme, netloc, path, query, fragment = urlsplit(url)
+    except ValueError:
+        # invalid IPv6 URL (normally square brackets in hostname part).
+        return unquote_quote(url)
+
+    try:
+        netloc = netloc.encode('idna').decode('ascii')  # IDN -> ACE
+    except UnicodeError:  # invalid domain part
+        return unquote_quote(url)
+
+    if query:
+        # Separately unquoting key/value, so as to not mix querystring separators
+        # included in query values. See #22267.
+        query_parts = [(unquote(q[0]), unquote(q[1]))
+                       for q in parse_qsl(query, keep_blank_values=True)]
+        # urlencode will take care of quoting
+        query = urlencode(query_parts)
+
+    path = unquote_quote(path)
+    fragment = unquote_quote(fragment)
+
+    return urlunsplit((scheme, netloc, path, query, fragment))
+
+
+@keep_lazy_text
+def urlize(text, trim_url_limit=None, nofollow=False, autoescape=False):
+    """
+    Convert any URLs in text into clickable links.
+
+    Works on http://, https://, www. links, and also on links ending in one of
+    the original seven gTLDs (.com, .edu, .gov, .int, .mil, .net, and .org).
+    Links can have trailing punctuation (periods, commas, close-parens) and
+    leading punctuation (opening parens) and it'll still do the right thing.
+
+    If trim_url_limit is not None, truncate the URLs in the link text longer
+    than this limit to trim_url_limit-3 characters and append an ellipsis.
+
+    If nofollow is True, give the links a rel="nofollow" attribute.
+
+    If autoescape is True, autoescape the link text and URLs.
+    """
+    safe_input = isinstance(text, SafeData)
+
+    def trim_url(x, limit=trim_url_limit):
+        if limit is None or len(x) <= limit:
+            return x
+        return '%s...' % x[:max(0, limit - 3)]
+
+    def unescape(text, trail):
+        """
+        If input URL is HTML-escaped, unescape it so that it can be safely fed
+        to smart_urlquote. For example:
+        http://example.com?x=1&amp;y=&lt;2&gt; => http://example.com?x=1&y=<2>
+        """
+        unescaped = (text + trail).replace(
+            '&amp;', '&').replace('&lt;', '<').replace(
+            '&gt;', '>').replace('&quot;', '"').replace('&#39;', "'")
+        if trail and unescaped.endswith(trail):
+            # Remove trail for unescaped if it was not consumed by unescape
+            unescaped = unescaped[:-len(trail)]
+        elif trail == ';':
+            # Trail was consumed by unescape (as end-of-entity marker), move it to text
+            text += trail
+            trail = ''
+        return text, unescaped, trail
+
+    def trim_punctuation(lead, middle, trail):
+        """
+        Trim trailing and wrapping punctuation from `middle`. Return the items
+        of the new state.
+        """
+        # Continue trimming until middle remains unchanged.
+        trimmed_something = True
+        while trimmed_something:
+            trimmed_something = False
+
+            # Trim trailing punctuation.
+            match = TRAILING_PUNCTUATION_RE.match(middle)
+            if match:
+                middle = match.group(1)
+                trail = match.group(2) + trail
+                trimmed_something = True
+
+            # Trim wrapping punctuation.
+            for opening, closing in WRAPPING_PUNCTUATION:
+                if middle.startswith(opening):
+                    middle = middle[len(opening):]
+                    lead += opening
+                    trimmed_something = True
+                # Keep parentheses at the end only if they're balanced.
+                if (middle.endswith(closing) and
+                        middle.count(closing) == middle.count(opening) + 1):
+                    middle = middle[:-len(closing)]
+                    trail = closing + trail
+                    trimmed_something = True
+        return lead, middle, trail
+
+    words = word_split_re.split(force_text(text))
+    for i, word in enumerate(words):
+        if '.' in word or '@' in word or ':' in word:
+            # lead: Current punctuation trimmed from the beginning of the word.
+            # middle: Current state of the word.
+            # trail: Current punctuation trimmed from the end of the word.
+            lead, middle, trail = '', word, ''
+            # Deal with punctuation.
+            lead, middle, trail = trim_punctuation(lead, middle, trail)
+
+            # Make URL we want to point to.
+            url = None
+            nofollow_attr = ' rel="nofollow"' if nofollow else ''
+            if simple_url_re.match(middle):
+                middle, middle_unescaped, trail = unescape(middle, trail)
+                url = smart_urlquote(middle_unescaped)
+            elif simple_url_2_re.match(middle):
+                middle, middle_unescaped, trail = unescape(middle, trail)
+                url = smart_urlquote('http://%s' % middle_unescaped)
+            elif ':' not in middle and simple_email_re.match(middle):
+                local, domain = middle.rsplit('@', 1)
+                try:
+                    domain = domain.encode('idna').decode('ascii')
+                except UnicodeError:
+                    continue
+                url = 'mailto:%s@%s' % (local, domain)
+                nofollow_attr = ''
+
+            # Make link.
+            if url:
+                trimmed = trim_url(middle)
+                if autoescape and not safe_input:
+                    lead, trail = escape(lead), escape(trail)
+                    trimmed = escape(trimmed)
+                middle = '<a href="%s"%s>%s</a>' % (escape(url), nofollow_attr, trimmed)
+                words[i] = mark_safe('%s%s%s' % (lead, middle, trail))
+            else:
+                if safe_input:
+                    words[i] = mark_safe(word)
+                elif autoescape:
+                    words[i] = escape(word)
+        elif safe_input:
+            words[i] = mark_safe(word)
+        elif autoescape:
+            words[i] = escape(word)
+    return ''.join(words)
+
+
+def avoid_wrapping(value):
+    """
+    Avoid text wrapping in the middle of a phrase by adding non-breaking
+    spaces where there previously were normal spaces.
+    """
+    return value.replace(" ", "\xa0")
+
+
+def html_safe(klass):
+    """
+    A decorator that defines the __html__ method. This helps non-Django
+    templates to detect classes whose __str__ methods return SafeText.
+    """
+    if '__html__' in klass.__dict__:
+        raise ValueError(
+            "can't apply @html_safe to %s because it defines "
+            "__html__()." % klass.__name__
+        )
+    if '__str__' not in klass.__dict__:
+        raise ValueError(
+            "can't apply @html_safe to %s because it doesn't "
+            "define __str__()." % klass.__name__
+        )
+    klass_str = klass.__str__
+    klass.__str__ = lambda self: mark_safe(klass_str(self))
+    klass.__html__ = lambda self: str(self)
+    return klass

flex/lib/python3.6/site-packages/django/utils/html_parser.py

@@ -0,0 +1,17 @@
+import html.parser
+
+try:
+    HTMLParseError = html.parser.HTMLParseError
+except AttributeError:
+    # create a dummy class for Python 3.5+ where it's been removed
+    class HTMLParseError(Exception):
+        pass
+
+
+class HTMLParser(html.parser.HTMLParser):
+    """Explicitly set convert_charrefs to be False.
+
+    This silences a deprecation warning on Python 3.4.
+    """
+    def __init__(self, convert_charrefs=False, **kwargs):
+        html.parser.HTMLParser.__init__(self, convert_charrefs=convert_charrefs, **kwargs)

flex/lib/python3.6/site-packages/django/utils/http.py

@@ -0,0 +1,439 @@
+import base64
+import calendar
+import datetime
+import re
+import unicodedata
+import warnings
+from binascii import Error as BinasciiError
+from email.utils import formatdate
+from urllib.parse import (
+    ParseResult, SplitResult, _coerce_args, _splitnetloc, _splitparams, quote,
+    quote_plus, scheme_chars, unquote, unquote_plus,
+    urlencode as original_urlencode, uses_params,
+)
+
+from django.core.exceptions import TooManyFieldsSent
+from django.utils.datastructures import MultiValueDict
+from django.utils.deprecation import RemovedInDjango21Warning
+from django.utils.encoding import force_bytes
+from django.utils.functional import keep_lazy_text
+
+# based on RFC 7232, Appendix C
+ETAG_MATCH = re.compile(r'''
+    \A(      # start of string and capture group
+    (?:W/)?  # optional weak indicator
+    "        # opening quote
+    [^"]*    # any sequence of non-quote characters
+    "        # end quote
+    )\Z      # end of string and capture group
+''', re.X)
+
+MONTHS = 'jan feb mar apr may jun jul aug sep oct nov dec'.split()
+__D = r'(?P<day>\d{2})'
+__D2 = r'(?P<day>[ \d]\d)'
+__M = r'(?P<mon>\w{3})'
+__Y = r'(?P<year>\d{4})'
+__Y2 = r'(?P<year>\d{2})'
+__T = r'(?P<hour>\d{2}):(?P<min>\d{2}):(?P<sec>\d{2})'
+RFC1123_DATE = re.compile(r'^\w{3}, %s %s %s %s GMT$' % (__D, __M, __Y, __T))
+RFC850_DATE = re.compile(r'^\w{6,9}, %s-%s-%s %s GMT$' % (__D, __M, __Y2, __T))
+ASCTIME_DATE = re.compile(r'^\w{3} %s %s %s %s$' % (__M, __D2, __T, __Y))
+
+RFC3986_GENDELIMS = ":/?#[]@"
+RFC3986_SUBDELIMS = "!$&'()*+,;="
+
+FIELDS_MATCH = re.compile('[&;]')
+
+
+@keep_lazy_text
+def urlquote(url, safe='/'):
+    """
+    A legacy compatibility wrapper to Python's urllib.parse.quote() function.
+    (was used for unicode handling on Python 2)
+    """
+    return quote(url, safe)
+
+
+@keep_lazy_text
+def urlquote_plus(url, safe=''):
+    """
+    A legacy compatibility wrapper to Python's urllib.parse.quote_plus()
+    function. (was used for unicode handling on Python 2)
+    """
+    return quote_plus(url, safe)
+
+
+@keep_lazy_text
+def urlunquote(quoted_url):
+    """
+    A legacy compatibility wrapper to Python's urllib.parse.unquote() function.
+    (was used for unicode handling on Python 2)
+    """
+    return unquote(quoted_url)
+
+
+@keep_lazy_text
+def urlunquote_plus(quoted_url):
+    """
+    A legacy compatibility wrapper to Python's urllib.parse.unquote_plus()
+    function. (was used for unicode handling on Python 2)
+    """
+    return unquote_plus(quoted_url)
+
+
+def urlencode(query, doseq=False):
+    """
+    A version of Python's urllib.parse.urlencode() function that can operate on
+    MultiValueDict and non-string values.
+    """
+    if isinstance(query, MultiValueDict):
+        query = query.lists()
+    elif hasattr(query, 'items'):
+        query = query.items()
+    query_params = []
+    for key, value in query:
+        if isinstance(value, (str, bytes)):
+            query_val = value
+        else:
+            try:
+                iter(value)
+            except TypeError:
+                query_val = value
+            else:
+                # Consume generators and iterators, even when doseq=True, to
+                # work around https://bugs.python.org/issue31706.
+                query_val = [
+                    item if isinstance(item, bytes) else str(item)
+                    for item in value
+                ]
+        query_params.append((key, query_val))
+    return original_urlencode(query_params, doseq)
+
+
+def cookie_date(epoch_seconds=None):
+    """
+    Format the time to ensure compatibility with Netscape's cookie standard.
+
+    `epoch_seconds` is a floating point number expressed in seconds since the
+    epoch, in UTC - such as that outputted by time.time(). If set to None, it
+    defaults to the current time.
+
+    Output a string in the format 'Wdy, DD-Mon-YYYY HH:MM:SS GMT'.
+    """
+    rfcdate = formatdate(epoch_seconds)
+    return '%s-%s-%s GMT' % (rfcdate[:7], rfcdate[8:11], rfcdate[12:25])
+
+
+def http_date(epoch_seconds=None):
+    """
+    Format the time to match the RFC1123 date format as specified by HTTP
+    RFC7231 section 7.1.1.1.
+
+    `epoch_seconds` is a floating point number expressed in seconds since the
+    epoch, in UTC - such as that outputted by time.time(). If set to None, it
+    defaults to the current time.
+
+    Output a string in the format 'Wdy, DD Mon YYYY HH:MM:SS GMT'.
+    """
+    return formatdate(epoch_seconds, usegmt=True)
+
+
+def parse_http_date(date):
+    """
+    Parse a date format as specified by HTTP RFC7231 section 7.1.1.1.
+
+    The three formats allowed by the RFC are accepted, even if only the first
+    one is still in widespread use.
+
+    Return an integer expressed in seconds since the epoch, in UTC.
+    """
+    # email.utils.parsedate() does the job for RFC1123 dates; unfortunately
+    # RFC7231 makes it mandatory to support RFC850 dates too. So we roll
+    # our own RFC-compliant parsing.
+    for regex in RFC1123_DATE, RFC850_DATE, ASCTIME_DATE:
+        m = regex.match(date)
+        if m is not None:
+            break
+    else:
+        raise ValueError("%r is not in a valid HTTP date format" % date)
+    try:
+        year = int(m.group('year'))
+        if year < 100:
+            if year < 70:
+                year += 2000
+            else:
+                year += 1900
+        month = MONTHS.index(m.group('mon').lower()) + 1
+        day = int(m.group('day'))
+        hour = int(m.group('hour'))
+        min = int(m.group('min'))
+        sec = int(m.group('sec'))
+        result = datetime.datetime(year, month, day, hour, min, sec)
+        return calendar.timegm(result.utctimetuple())
+    except Exception as exc:
+        raise ValueError("%r is not a valid date" % date) from exc
+
+
+def parse_http_date_safe(date):
+    """
+    Same as parse_http_date, but return None if the input is invalid.
+    """
+    try:
+        return parse_http_date(date)
+    except Exception:
+        pass
+
+
+# Base 36 functions: useful for generating compact URLs
+
+def base36_to_int(s):
+    """
+    Convert a base 36 string to an int. Raise ValueError if the input won't fit
+    into an int.
+    """
+    # To prevent overconsumption of server resources, reject any
+    # base36 string that is longer than 13 base36 digits (13 digits
+    # is sufficient to base36-encode any 64-bit integer)
+    if len(s) > 13:
+        raise ValueError("Base36 input too large")
+    return int(s, 36)
+
+
+def int_to_base36(i):
+    """Convert an integer to a base36 string."""
+    char_set = '0123456789abcdefghijklmnopqrstuvwxyz'
+    if i < 0:
+        raise ValueError("Negative base36 conversion input.")
+    if i < 36:
+        return char_set[i]
+    b36 = ''
+    while i != 0:
+        i, n = divmod(i, 36)
+        b36 = char_set[n] + b36
+    return b36
+
+
+def urlsafe_base64_encode(s):
+    """
+    Encode a bytestring in base64 for use in URLs. Strip any trailing equal
+    signs.
+    """
+    return base64.urlsafe_b64encode(s).rstrip(b'\n=')
+
+
+def urlsafe_base64_decode(s):
+    """
+    Decode a base64 encoded string. Add back any trailing equal signs that
+    might have been stripped.
+    """
+    s = force_bytes(s)
+    try:
+        return base64.urlsafe_b64decode(s.ljust(len(s) + len(s) % 4, b'='))
+    except (LookupError, BinasciiError) as e:
+        raise ValueError(e)
+
+
+def parse_etags(etag_str):
+    """
+    Parse a string of ETags given in an If-None-Match or If-Match header as
+    defined by RFC 7232. Return a list of quoted ETags, or ['*'] if all ETags
+    should be matched.
+    """
+    if etag_str.strip() == '*':
+        return ['*']
+    else:
+        # Parse each ETag individually, and return any that are valid.
+        etag_matches = (ETAG_MATCH.match(etag.strip()) for etag in etag_str.split(','))
+        return [match.group(1) for match in etag_matches if match]
+
+
+def quote_etag(etag_str):
+    """
+    If the provided string is already a quoted ETag, return it. Otherwise, wrap
+    the string in quotes, making it a strong ETag.
+    """
+    if ETAG_MATCH.match(etag_str):
+        return etag_str
+    else:
+        return '"%s"' % etag_str
+
+
+def is_same_domain(host, pattern):
+    """
+    Return ``True`` if the host is either an exact match or a match
+    to the wildcard pattern.
+
+    Any pattern beginning with a period matches a domain and all of its
+    subdomains. (e.g. ``.example.com`` matches ``example.com`` and
+    ``foo.example.com``). Anything else is an exact string match.
+    """
+    if not pattern:
+        return False
+
+    pattern = pattern.lower()
+    return (
+        pattern[0] == '.' and (host.endswith(pattern) or host == pattern[1:]) or
+        pattern == host
+    )
+
+
+def is_safe_url(url, host=None, allowed_hosts=None, require_https=False):
+    """
+    Return ``True`` if the url is a safe redirection (i.e. it doesn't point to
+    a different host and uses a safe scheme).
+
+    Always return ``False`` on an empty url.
+
+    If ``require_https`` is ``True``, only 'https' will be considered a valid
+    scheme, as opposed to 'http' and 'https' with the default, ``False``.
+    """
+    if url is not None:
+        url = url.strip()
+    if not url:
+        return False
+    if allowed_hosts is None:
+        allowed_hosts = set()
+    if host:
+        warnings.warn(
+            "The host argument is deprecated, use allowed_hosts instead.",
+            RemovedInDjango21Warning,
+            stacklevel=2,
+        )
+        # Avoid mutating the passed in allowed_hosts.
+        allowed_hosts = allowed_hosts | {host}
+    # Chrome treats \ completely as / in paths but it could be part of some
+    # basic auth credentials so we need to check both URLs.
+    return (_is_safe_url(url, allowed_hosts, require_https=require_https) and
+            _is_safe_url(url.replace('\\', '/'), allowed_hosts, require_https=require_https))
+
+
+# Copied from urllib.parse.urlparse() but uses fixed urlsplit() function.
+def _urlparse(url, scheme='', allow_fragments=True):
+    """Parse a URL into 6 components:
+    <scheme>://<netloc>/<path>;<params>?<query>#<fragment>
+    Return a 6-tuple: (scheme, netloc, path, params, query, fragment).
+    Note that we don't break the components up in smaller bits
+    (e.g. netloc is a single string) and we don't expand % escapes."""
+    url, scheme, _coerce_result = _coerce_args(url, scheme)
+    splitresult = _urlsplit(url, scheme, allow_fragments)
+    scheme, netloc, url, query, fragment = splitresult
+    if scheme in uses_params and ';' in url:
+        url, params = _splitparams(url)
+    else:
+        params = ''
+    result = ParseResult(scheme, netloc, url, params, query, fragment)
+    return _coerce_result(result)
+
+
+# Copied from urllib.parse.urlsplit() with
+# https://github.com/python/cpython/pull/661 applied.
+def _urlsplit(url, scheme='', allow_fragments=True):
+    """Parse a URL into 5 components:
+    <scheme>://<netloc>/<path>?<query>#<fragment>
+    Return a 5-tuple: (scheme, netloc, path, query, fragment).
+    Note that we don't break the components up in smaller bits
+    (e.g. netloc is a single string) and we don't expand % escapes."""
+    url, scheme, _coerce_result = _coerce_args(url, scheme)
+    allow_fragments = bool(allow_fragments)
+    netloc = query = fragment = ''
+    i = url.find(':')
+    if i > 0:
+        for c in url[:i]:
+            if c not in scheme_chars:
+                break
+        else:
+            scheme, url = url[:i].lower(), url[i + 1:]
+
+    if url[:2] == '//':
+        netloc, url = _splitnetloc(url, 2)
+        if (('[' in netloc and ']' not in netloc) or
+                (']' in netloc and '[' not in netloc)):
+            raise ValueError("Invalid IPv6 URL")
+    if allow_fragments and '#' in url:
+        url, fragment = url.split('#', 1)
+    if '?' in url:
+        url, query = url.split('?', 1)
+    v = SplitResult(scheme, netloc, url, query, fragment)
+    return _coerce_result(v)
+
+
+def _is_safe_url(url, allowed_hosts, require_https=False):
+    # Chrome considers any URL with more than two slashes to be absolute, but
+    # urlparse is not so flexible. Treat any url with three slashes as unsafe.
+    if url.startswith('///'):
+        return False
+    try:
+        url_info = _urlparse(url)
+    except ValueError:  # e.g. invalid IPv6 addresses
+        return False
+    # Forbid URLs like http:///example.com - with a scheme, but without a hostname.
+    # In that URL, example.com is not the hostname but, a path component. However,
+    # Chrome will still consider example.com to be the hostname, so we must not
+    # allow this syntax.
+    if not url_info.netloc and url_info.scheme:
+        return False
+    # Forbid URLs that start with control characters. Some browsers (like
+    # Chrome) ignore quite a few control characters at the start of a
+    # URL and might consider the URL as scheme relative.
+    if unicodedata.category(url[0])[0] == 'C':
+        return False
+    scheme = url_info.scheme
+    # Consider URLs without a scheme (e.g. //example.com/p) to be http.
+    if not url_info.scheme and url_info.netloc:
+        scheme = 'http'
+    valid_schemes = ['https'] if require_https else ['http', 'https']
+    return ((not url_info.netloc or url_info.netloc in allowed_hosts) and
+            (not scheme or scheme in valid_schemes))
+
+
+def limited_parse_qsl(qs, keep_blank_values=False, encoding='utf-8',
+                      errors='replace', fields_limit=None):
+    """
+    Return a list of key/value tuples parsed from query string.
+
+    Copied from urlparse with an additional "fields_limit" argument.
+    Copyright (C) 2013 Python Software Foundation (see LICENSE.python).
+
+    Arguments:
+
+    qs: percent-encoded query string to be parsed
+
+    keep_blank_values: flag indicating whether blank values in
+        percent-encoded queries should be treated as blank strings. A
+        true value indicates that blanks should be retained as blank
+        strings. The default false value indicates that blank values
+        are to be ignored and treated as if they were  not included.
+
+    encoding and errors: specify how to decode percent-encoded sequences
+        into Unicode characters, as accepted by the bytes.decode() method.
+
+    fields_limit: maximum number of fields parsed or an exception
+        is raised. None means no limit and is the default.
+    """
+    if fields_limit:
+        pairs = FIELDS_MATCH.split(qs, fields_limit)
+        if len(pairs) > fields_limit:
+            raise TooManyFieldsSent(
+                'The number of GET/POST parameters exceeded '
+                'settings.DATA_UPLOAD_MAX_NUMBER_FIELDS.'
+            )
+    else:
+        pairs = FIELDS_MATCH.split(qs)
+    r = []
+    for name_value in pairs:
+        if not name_value:
+            continue
+        nv = name_value.split('=', 1)
+        if len(nv) != 2:
+            # Handle case of a control-name with no equal sign
+            if keep_blank_values:
+                nv.append('')
+            else:
+                continue
+        if len(nv[1]) or keep_blank_values:
+            name = nv[0].replace('+', ' ')
+            name = unquote(name, encoding=encoding, errors=errors)
+            value = nv[1].replace('+', ' ')
+            value = unquote(value, encoding=encoding, errors=errors)
+            r.append((name, value))
+    return r

flex/lib/python3.6/site-packages/django/utils/inspect.py

@@ -0,0 +1,62 @@
+import inspect
+
+
+def get_func_args(func):
+    sig = inspect.signature(func)
+    return [
+        arg_name for arg_name, param in sig.parameters.items()
+        if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD
+    ]
+
+
+def get_func_full_args(func):
+    """
+    Return a list of (argument name, default value) tuples. If the argument
+    does not have a default value, omit it in the tuple. Arguments such as
+    *args and **kwargs are also included.
+    """
+    sig = inspect.signature(func)
+    args = []
+    for arg_name, param in sig.parameters.items():
+        name = arg_name
+        # Ignore 'self'
+        if name == 'self':
+            continue
+        if param.kind == inspect.Parameter.VAR_POSITIONAL:
+            name = '*' + name
+        elif param.kind == inspect.Parameter.VAR_KEYWORD:
+            name = '**' + name
+        if param.default != inspect.Parameter.empty:
+            args.append((name, param.default))
+        else:
+            args.append((name,))
+    return args
+
+
+def func_accepts_kwargs(func):
+    return any(
+        p for p in inspect.signature(func).parameters.values()
+        if p.kind == p.VAR_KEYWORD
+    )
+
+
+def func_accepts_var_args(func):
+    """
+    Return True if function 'func' accepts positional arguments *args.
+    """
+    return any(
+        p for p in inspect.signature(func).parameters.values()
+        if p.kind == p.VAR_POSITIONAL
+    )
+
+
+def func_has_no_args(func):
+    args = [
+        p for p in inspect.signature(func).parameters.values()
+        if p.kind == p.POSITIONAL_OR_KEYWORD
+    ]
+    return len(args) == 1
+
+
+def func_supports_parameter(func, parameter):
+    return parameter in inspect.signature(func).parameters

flex/lib/python3.6/site-packages/django/utils/ipv6.py

@@ -0,0 +1,46 @@
+import ipaddress
+
+from django.core.exceptions import ValidationError
+from django.utils.translation import gettext_lazy as _
+
+
+def clean_ipv6_address(ip_str, unpack_ipv4=False,
+                       error_message=_("This is not a valid IPv6 address.")):
+    """
+    Clean an IPv6 address string.
+
+    Raise ValidationError if the address is invalid.
+
+    Replace the longest continuous zero-sequence with "::", remove leading
+    zeroes, and make sure all hextets are lowercase.
+
+    Args:
+        ip_str: A valid IPv6 address.
+        unpack_ipv4: if an IPv4-mapped address is found,
+        return the plain IPv4 address (default=False).
+        error_message: An error message used in the ValidationError.
+
+    Return a compressed IPv6 address or the same value.
+    """
+    try:
+        addr = ipaddress.IPv6Address(int(ipaddress.IPv6Address(ip_str)))
+    except ValueError:
+        raise ValidationError(error_message, code='invalid')
+
+    if unpack_ipv4 and addr.ipv4_mapped:
+        return str(addr.ipv4_mapped)
+    elif addr.ipv4_mapped:
+        return '::ffff:%s' % str(addr.ipv4_mapped)
+
+    return str(addr)
+
+
+def is_valid_ipv6_address(ip_str):
+    """
+    Return whether or not the `ip_str` string is a valid IPv6 address.
+    """
+    try:
+        ipaddress.IPv6Address(ip_str)
+    except ValueError:
+        return False
+    return True

flex/lib/python3.6/site-packages/django/utils/itercompat.py

@@ -0,0 +1,8 @@
+def is_iterable(x):
+    "An implementation independent way of checking for iterables"
+    try:
+        iter(x)
+    except TypeError:
+        return False
+    else:
+        return True

flex/lib/python3.6/site-packages/django/utils/jslex.py

@@ -0,0 +1,220 @@
+"""JsLex: a lexer for Javascript"""
+# Originally from https://bitbucket.org/ned/jslex
+import re
+
+
+class Tok:
+    """
+    A specification for a token class.
+    """
+    num = 0
+
+    def __init__(self, name, regex, next=None):
+        self.id = Tok.num
+        Tok.num += 1
+        self.name = name
+        self.regex = regex
+        self.next = next
+
+
+def literals(choices, prefix="", suffix=""):
+    """
+    Create a regex from a space-separated list of literal `choices`.
+
+    If provided, `prefix` and `suffix` will be attached to each choice
+    individually.
+    """
+    return "|".join(prefix + re.escape(c) + suffix for c in choices.split())
+
+
+class Lexer:
+    """
+    A generic multi-state regex-based lexer.
+    """
+
+    def __init__(self, states, first):
+        self.regexes = {}
+        self.toks = {}
+
+        for state, rules in states.items():
+            parts = []
+            for tok in rules:
+                groupid = "t%d" % tok.id
+                self.toks[groupid] = tok
+                parts.append("(?P<%s>%s)" % (groupid, tok.regex))
+            self.regexes[state] = re.compile("|".join(parts), re.MULTILINE | re.VERBOSE)
+
+        self.state = first
+
+    def lex(self, text):
+        """
+        Lexically analyze `text`.
+
+        Yield pairs (`name`, `tokentext`).
+        """
+        end = len(text)
+        state = self.state
+        regexes = self.regexes
+        toks = self.toks
+        start = 0
+
+        while start < end:
+            for match in regexes[state].finditer(text, start):
+                name = match.lastgroup
+                tok = toks[name]
+                toktext = match.group(name)
+                start += len(toktext)
+                yield (tok.name, toktext)
+
+                if tok.next:
+                    state = tok.next
+                    break
+
+        self.state = state
+
+
+class JsLexer(Lexer):
+    """
+    A Javascript lexer
+
+    >>> lexer = JsLexer()
+    >>> list(lexer.lex("a = 1"))
+    [('id', 'a'), ('ws', ' '), ('punct', '='), ('ws', ' '), ('dnum', '1')]
+
+    This doesn't properly handle non-ASCII characters in the Javascript source.
+    """
+
+    # Because these tokens are matched as alternatives in a regex, longer
+    # possibilities must appear in the list before shorter ones, for example,
+    # '>>' before '>'.
+    #
+    # Note that we don't have to detect malformed Javascript, only properly
+    # lex correct Javascript, so much of this is simplified.
+
+    # Details of Javascript lexical structure are taken from
+    # http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf
+
+    # A useful explanation of automatic semicolon insertion is at
+    # http://inimino.org/~inimino/blog/javascript_semicolons
+
+    both_before = [
+        Tok("comment", r"/\*(.|\n)*?\*/"),
+        Tok("linecomment", r"//.*?$"),
+        Tok("ws", r"\s+"),
+        Tok("keyword", literals("""
+                           break case catch class const continue debugger
+                           default delete do else enum export extends
+                           finally for function if import in instanceof
+                           new return super switch this throw try typeof
+                           var void while with
+                           """, suffix=r"\b"), next='reg'),
+        Tok("reserved", literals("null true false", suffix=r"\b"), next='div'),
+        Tok("id", r"""
+                  ([a-zA-Z_$   ]|\\u[0-9a-fA-Z]{4})   # first char
+                  ([a-zA-Z_$0-9]|\\u[0-9a-fA-F]{4})*  # rest chars
+                  """, next='div'),
+        Tok("hnum", r"0[xX][0-9a-fA-F]+", next='div'),
+        Tok("onum", r"0[0-7]+"),
+        Tok("dnum", r"""
+                    (   (0|[1-9][0-9]*)     # DecimalIntegerLiteral
+                        \.                  # dot
+                        [0-9]*              # DecimalDigits-opt
+                        ([eE][-+]?[0-9]+)?  # ExponentPart-opt
+                    |
+                        \.                  # dot
+                        [0-9]+              # DecimalDigits
+                        ([eE][-+]?[0-9]+)?  # ExponentPart-opt
+                    |
+                        (0|[1-9][0-9]*)     # DecimalIntegerLiteral
+                        ([eE][-+]?[0-9]+)?  # ExponentPart-opt
+                    )
+                    """, next='div'),
+        Tok("punct", literals("""
+                         >>>= === !== >>> <<= >>= <= >= == != << >> &&
+                         || += -= *= %= &= |= ^=
+                         """), next="reg"),
+        Tok("punct", literals("++ -- ) ]"), next='div'),
+        Tok("punct", literals("{ } ( [ . ; , < > + - * % & | ^ ! ~ ? : ="), next='reg'),
+        Tok("string", r'"([^"\\]|(\\(.|\n)))*?"', next='div'),
+        Tok("string", r"'([^'\\]|(\\(.|\n)))*?'", next='div'),
+    ]
+
+    both_after = [
+        Tok("other", r"."),
+    ]
+
+    states = {
+        # slash will mean division
+        'div': both_before + [
+            Tok("punct", literals("/= /"), next='reg'),
+        ] + both_after,
+
+        # slash will mean regex
+        'reg': both_before + [
+            Tok("regex",
+                r"""
+                    /                       # opening slash
+                    # First character is..
+                    (   [^*\\/[]            # anything but * \ / or [
+                    |   \\.                 # or an escape sequence
+                    |   \[                  # or a class, which has
+                            (   [^\]\\]     #   anything but \ or ]
+                            |   \\.         #   or an escape sequence
+                            )*              #   many times
+                        \]
+                    )
+                    # Following characters are same, except for excluding a star
+                    (   [^\\/[]             # anything but \ / or [
+                    |   \\.                 # or an escape sequence
+                    |   \[                  # or a class, which has
+                            (   [^\]\\]     #   anything but \ or ]
+                            |   \\.         #   or an escape sequence
+                            )*              #   many times
+                        \]
+                    )*                      # many times
+                    /                       # closing slash
+                    [a-zA-Z0-9]*            # trailing flags
+                """, next='div'),
+        ] + both_after,
+    }
+
+    def __init__(self):
+        super().__init__(self.states, 'reg')
+
+
+def prepare_js_for_gettext(js):
+    """
+    Convert the Javascript source `js` into something resembling C for
+    xgettext.
+
+    What actually happens is that all the regex literals are replaced with
+    "REGEX".
+    """
+    def escape_quotes(m):
+        """Used in a regex to properly escape double quotes."""
+        s = m.group(0)
+        if s == '"':
+            return r'\"'
+        else:
+            return s
+
+    lexer = JsLexer()
+    c = []
+    for name, tok in lexer.lex(js):
+        if name == 'regex':
+            # C doesn't grok regexes, and they aren't needed for gettext,
+            # so just output a string instead.
+            tok = '"REGEX"'
+        elif name == 'string':
+            # C doesn't have single-quoted strings, so make all strings
+            # double-quoted.
+            if tok.startswith("'"):
+                guts = re.sub(r"\\.|.", escape_quotes, tok[1:-1])
+                tok = '"' + guts + '"'
+        elif name == 'id':
+            # C can't deal with Unicode escapes in identifiers.  We don't
+            # need them for gettext anyway, so replace them with something
+            # innocuous
+            tok = tok.replace("\\", "U")
+        c.append(tok)
+    return ''.join(c)

flex/lib/python3.6/site-packages/django/utils/log.py

@@ -0,0 +1,193 @@
+import logging
+import logging.config  # needed when logging_config doesn't start with logging.config
+from copy import copy
+
+from django.conf import settings
+from django.core import mail
+from django.core.mail import get_connection
+from django.core.management.color import color_style
+from django.utils.module_loading import import_string
+from django.views.debug import ExceptionReporter
+
+# Default logging for Django. This sends an email to the site admins on every
+# HTTP 500 error. Depending on DEBUG, all other log records are either sent to
+# the console (DEBUG=True) or discarded (DEBUG=False) by means of the
+# require_debug_true filter.
+DEFAULT_LOGGING = {
+    'version': 1,
+    'disable_existing_loggers': False,
+    'filters': {
+        'require_debug_false': {
+            '()': 'django.utils.log.RequireDebugFalse',
+        },
+        'require_debug_true': {
+            '()': 'django.utils.log.RequireDebugTrue',
+        },
+    },
+    'formatters': {
+        'django.server': {
+            '()': 'django.utils.log.ServerFormatter',
+            'format': '[%(server_time)s] %(message)s',
+        }
+    },
+    'handlers': {
+        'console': {
+            'level': 'INFO',
+            'filters': ['require_debug_true'],
+            'class': 'logging.StreamHandler',
+        },
+        'django.server': {
+            'level': 'INFO',
+            'class': 'logging.StreamHandler',
+            'formatter': 'django.server',
+        },
+        'mail_admins': {
+            'level': 'ERROR',
+            'filters': ['require_debug_false'],
+            'class': 'django.utils.log.AdminEmailHandler'
+        }
+    },
+    'loggers': {
+        'django': {
+            'handlers': ['console', 'mail_admins'],
+            'level': 'INFO',
+        },
+        'django.server': {
+            'handlers': ['django.server'],
+            'level': 'INFO',
+            'propagate': False,
+        },
+    }
+}
+
+
+def configure_logging(logging_config, logging_settings):
+    if logging_config:
+        # First find the logging configuration function ...
+        logging_config_func = import_string(logging_config)
+
+        logging.config.dictConfig(DEFAULT_LOGGING)
+
+        # ... then invoke it with the logging settings
+        if logging_settings:
+            logging_config_func(logging_settings)
+
+
+class AdminEmailHandler(logging.Handler):
+    """An exception log handler that emails log entries to site admins.
+
+    If the request is passed as the first argument to the log record,
+    request data will be provided in the email report.
+    """
+
+    def __init__(self, include_html=False, email_backend=None):
+        logging.Handler.__init__(self)
+        self.include_html = include_html
+        self.email_backend = email_backend
+
+    def emit(self, record):
+        try:
+            request = record.request
+            subject = '%s (%s IP): %s' % (
+                record.levelname,
+                ('internal' if request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS
+                 else 'EXTERNAL'),
+                record.getMessage()
+            )
+        except Exception:
+            subject = '%s: %s' % (
+                record.levelname,
+                record.getMessage()
+            )
+            request = None
+        subject = self.format_subject(subject)
+
+        # Since we add a nicely formatted traceback on our own, create a copy
+        # of the log record without the exception data.
+        no_exc_record = copy(record)
+        no_exc_record.exc_info = None
+        no_exc_record.exc_text = None
+
+        if record.exc_info:
+            exc_info = record.exc_info
+        else:
+            exc_info = (None, record.getMessage(), None)
+
+        reporter = ExceptionReporter(request, is_email=True, *exc_info)
+        message = "%s\n\n%s" % (self.format(no_exc_record), reporter.get_traceback_text())
+        html_message = reporter.get_traceback_html() if self.include_html else None
+        self.send_mail(subject, message, fail_silently=True, html_message=html_message)
+
+    def send_mail(self, subject, message, *args, **kwargs):
+        mail.mail_admins(subject, message, *args, connection=self.connection(), **kwargs)
+
+    def connection(self):
+        return get_connection(backend=self.email_backend, fail_silently=True)
+
+    def format_subject(self, subject):
+        """
+        Escape CR and LF characters.
+        """
+        return subject.replace('\n', '\\n').replace('\r', '\\r')
+
+
+class CallbackFilter(logging.Filter):
+    """
+    A logging filter that checks the return value of a given callable (which
+    takes the record-to-be-logged as its only parameter) to decide whether to
+    log a record.
+    """
+    def __init__(self, callback):
+        self.callback = callback
+
+    def filter(self, record):
+        if self.callback(record):
+            return 1
+        return 0
+
+
+class RequireDebugFalse(logging.Filter):
+    def filter(self, record):
+        return not settings.DEBUG
+
+
+class RequireDebugTrue(logging.Filter):
+    def filter(self, record):
+        return settings.DEBUG
+
+
+class ServerFormatter(logging.Formatter):
+    def __init__(self, *args, **kwargs):
+        self.style = color_style()
+        super().__init__(*args, **kwargs)
+
+    def format(self, record):
+        msg = record.msg
+        status_code = getattr(record, 'status_code', None)
+
+        if status_code:
+            if 200 <= status_code < 300:
+                # Put 2XX first, since it should be the common case
+                msg = self.style.HTTP_SUCCESS(msg)
+            elif 100 <= status_code < 200:
+                msg = self.style.HTTP_INFO(msg)
+            elif status_code == 304:
+                msg = self.style.HTTP_NOT_MODIFIED(msg)
+            elif 300 <= status_code < 400:
+                msg = self.style.HTTP_REDIRECT(msg)
+            elif status_code == 404:
+                msg = self.style.HTTP_NOT_FOUND(msg)
+            elif 400 <= status_code < 500:
+                msg = self.style.HTTP_BAD_REQUEST(msg)
+            else:
+                # Any 5XX, or any other status code
+                msg = self.style.HTTP_SERVER_ERROR(msg)
+
+        if self.uses_server_time() and not hasattr(record, 'server_time'):
+            record.server_time = self.formatTime(record, self.datefmt)
+
+        record.msg = msg
+        return super().format(record)
+
+    def uses_server_time(self):
+        return self._fmt.find('%(server_time)') >= 0

flex/lib/python3.6/site-packages/django/utils/lorem_ipsum.py

@@ -0,0 +1,114 @@
+"""
+Utility functions for generating "lorem ipsum" Latin text.
+"""
+
+import random
+
+COMMON_P = (
+    'Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod '
+    'tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim '
+    'veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea '
+    'commodo consequat. Duis aute irure dolor in reprehenderit in voluptate '
+    'velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint '
+    'occaecat cupidatat non proident, sunt in culpa qui officia deserunt '
+    'mollit anim id est laborum.'
+)
+
+WORDS = (
+    'exercitationem', 'perferendis', 'perspiciatis', 'laborum', 'eveniet',
+    'sunt', 'iure', 'nam', 'nobis', 'eum', 'cum', 'officiis', 'excepturi',
+    'odio', 'consectetur', 'quasi', 'aut', 'quisquam', 'vel', 'eligendi',
+    'itaque', 'non', 'odit', 'tempore', 'quaerat', 'dignissimos',
+    'facilis', 'neque', 'nihil', 'expedita', 'vitae', 'vero', 'ipsum',
+    'nisi', 'animi', 'cumque', 'pariatur', 'velit', 'modi', 'natus',
+    'iusto', 'eaque', 'sequi', 'illo', 'sed', 'ex', 'et', 'voluptatibus',
+    'tempora', 'veritatis', 'ratione', 'assumenda', 'incidunt', 'nostrum',
+    'placeat', 'aliquid', 'fuga', 'provident', 'praesentium', 'rem',
+    'necessitatibus', 'suscipit', 'adipisci', 'quidem', 'possimus',
+    'voluptas', 'debitis', 'sint', 'accusantium', 'unde', 'sapiente',
+    'voluptate', 'qui', 'aspernatur', 'laudantium', 'soluta', 'amet',
+    'quo', 'aliquam', 'saepe', 'culpa', 'libero', 'ipsa', 'dicta',
+    'reiciendis', 'nesciunt', 'doloribus', 'autem', 'impedit', 'minima',
+    'maiores', 'repudiandae', 'ipsam', 'obcaecati', 'ullam', 'enim',
+    'totam', 'delectus', 'ducimus', 'quis', 'voluptates', 'dolores',
+    'molestiae', 'harum', 'dolorem', 'quia', 'voluptatem', 'molestias',
+    'magni', 'distinctio', 'omnis', 'illum', 'dolorum', 'voluptatum', 'ea',
+    'quas', 'quam', 'corporis', 'quae', 'blanditiis', 'atque', 'deserunt',
+    'laboriosam', 'earum', 'consequuntur', 'hic', 'cupiditate',
+    'quibusdam', 'accusamus', 'ut', 'rerum', 'error', 'minus', 'eius',
+    'ab', 'ad', 'nemo', 'fugit', 'officia', 'at', 'in', 'id', 'quos',
+    'reprehenderit', 'numquam', 'iste', 'fugiat', 'sit', 'inventore',
+    'beatae', 'repellendus', 'magnam', 'recusandae', 'quod', 'explicabo',
+    'doloremque', 'aperiam', 'consequatur', 'asperiores', 'commodi',
+    'optio', 'dolor', 'labore', 'temporibus', 'repellat', 'veniam',
+    'architecto', 'est', 'esse', 'mollitia', 'nulla', 'a', 'similique',
+    'eos', 'alias', 'dolore', 'tenetur', 'deleniti', 'porro', 'facere',
+    'maxime', 'corrupti',
+)
+
+COMMON_WORDS = (
+    'lorem', 'ipsum', 'dolor', 'sit', 'amet', 'consectetur',
+    'adipisicing', 'elit', 'sed', 'do', 'eiusmod', 'tempor', 'incididunt',
+    'ut', 'labore', 'et', 'dolore', 'magna', 'aliqua',
+)
+
+
+def sentence():
+    """
+    Return a randomly generated sentence of lorem ipsum text.
+
+    The first word is capitalized, and the sentence ends in either a period or
+    question mark. Commas are added at random.
+    """
+    # Determine the number of comma-separated sections and number of words in
+    # each section for this sentence.
+    sections = [' '.join(random.sample(WORDS, random.randint(3, 12))) for i in range(random.randint(1, 5))]
+    s = ', '.join(sections)
+    # Convert to sentence case and add end punctuation.
+    return '%s%s%s' % (s[0].upper(), s[1:], random.choice('?.'))
+
+
+def paragraph():
+    """
+    Return a randomly generated paragraph of lorem ipsum text.
+
+    The paragraph consists of between 1 and 4 sentences, inclusive.
+    """
+    return ' '.join(sentence() for i in range(random.randint(1, 4)))
+
+
+def paragraphs(count, common=True):
+    """
+    Return a list of paragraphs as returned by paragraph().
+
+    If `common` is True, then the first paragraph will be the standard
+    'lorem ipsum' paragraph. Otherwise, the first paragraph will be random
+    Latin text. Either way, subsequent paragraphs will be random Latin text.
+    """
+    paras = []
+    for i in range(count):
+        if common and i == 0:
+            paras.append(COMMON_P)
+        else:
+            paras.append(paragraph())
+    return paras
+
+
+def words(count, common=True):
+    """
+    Return a string of `count` lorem ipsum words separated by a single space.
+
+    If `common` is True, then the first 19 words will be the standard
+    'lorem ipsum' words. Otherwise, all words will be selected randomly.
+    """
+    word_list = list(COMMON_WORDS) if common else []
+    c = len(word_list)
+    if count > c:
+        count -= c
+        while count > 0:
+            c = min(count, len(WORDS))
+            count -= c
+            word_list += random.sample(WORDS, c)
+    else:
+        word_list = word_list[:count]
+    return ' '.join(word_list)

flex/lib/python3.6/site-packages/django/utils/lru_cache.py

@@ -0,0 +1,5 @@
+from functools import lru_cache  # noqa
+
+# Deprecate or remove this module when no supported version of Django still
+# supports Python 2. Until then, keep it to allow pluggable apps to support
+# Python 2 and Python 3 without raising a deprecation warning.

flex/lib/python3.6/site-packages/django/utils/module_loading.py

@@ -0,0 +1,98 @@
+import copy
+import os
+from importlib import import_module
+from importlib.util import find_spec as importlib_find
+
+
+def import_string(dotted_path):
+    """
+    Import a dotted module path and return the attribute/class designated by the
+    last name in the path. Raise ImportError if the import failed.
+    """
+    try:
+        module_path, class_name = dotted_path.rsplit('.', 1)
+    except ValueError as err:
+        raise ImportError("%s doesn't look like a module path" % dotted_path) from err
+
+    module = import_module(module_path)
+
+    try:
+        return getattr(module, class_name)
+    except AttributeError as err:
+        raise ImportError('Module "%s" does not define a "%s" attribute/class' % (
+            module_path, class_name)
+        ) from err
+
+
+def autodiscover_modules(*args, **kwargs):
+    """
+    Auto-discover INSTALLED_APPS modules and fail silently when
+    not present. This forces an import on them to register any admin bits they
+    may want.
+
+    You may provide a register_to keyword parameter as a way to access a
+    registry. This register_to object must have a _registry instance variable
+    to access it.
+    """
+    from django.apps import apps
+
+    register_to = kwargs.get('register_to')
+    for app_config in apps.get_app_configs():
+        for module_to_search in args:
+            # Attempt to import the app's module.
+            try:
+                if register_to:
+                    before_import_registry = copy.copy(register_to._registry)
+
+                import_module('%s.%s' % (app_config.name, module_to_search))
+            except Exception:
+                # Reset the registry to the state before the last import
+                # as this import will have to reoccur on the next request and
+                # this could raise NotRegistered and AlreadyRegistered
+                # exceptions (see #8245).
+                if register_to:
+                    register_to._registry = before_import_registry
+
+                # Decide whether to bubble up this error. If the app just
+                # doesn't have the module in question, we can ignore the error
+                # attempting to import it, otherwise we want it to bubble up.
+                if module_has_submodule(app_config.module, module_to_search):
+                    raise
+
+
+def module_has_submodule(package, module_name):
+    """See if 'module' is in 'package'."""
+    try:
+        package_name = package.__name__
+        package_path = package.__path__
+    except AttributeError:
+        # package isn't a package.
+        return False
+
+    full_module_name = package_name + '.' + module_name
+    try:
+        return importlib_find(full_module_name, package_path) is not None
+    except (ImportError, AttributeError):
+        # When module_name is an invalid dotted path, Python raises ImportError
+        # (or ModuleNotFoundError in Python 3.6+). AttributeError may be raised
+        # if the penultimate part of the path is not a package.
+        # (http://bugs.python.org/issue30436)
+        return False
+
+
+def module_dir(module):
+    """
+    Find the name of the directory that contains a module, if possible.
+
+    Raise ValueError otherwise, e.g. for namespace packages that are split
+    over several directories.
+    """
+    # Convert to list because _NamespacePath does not support indexing on 3.3.
+    paths = list(getattr(module, '__path__', []))
+    if len(paths) == 1:
+        return paths[0]
+    else:
+        filename = getattr(module, '__file__', None)
+        if filename is not None:
+            return os.path.dirname(filename)
+    raise ValueError("Cannot determine directory containing %s" % module)

flex/lib/python3.6/site-packages/django/utils/numberformat.py

@@ -0,0 +1,67 @@
+from decimal import Decimal
+
+from django.conf import settings
+from django.utils.safestring import mark_safe
+
+
+def format(number, decimal_sep, decimal_pos=None, grouping=0, thousand_sep='',
+           force_grouping=False):
+    """
+    Get a number (as a number or string), and return it as a string,
+    using formats defined as arguments:
+
+    * decimal_sep: Decimal separator symbol (for example ".")
+    * decimal_pos: Number of decimal positions
+    * grouping: Number of digits in every group limited by thousand separator.
+        For non-uniform digit grouping, it can be a sequence with the number
+        of digit group sizes following the format used by the Python locale
+        module in locale.localeconv() LC_NUMERIC grouping (e.g. (3, 2, 0)).
+    * thousand_sep: Thousand separator symbol (for example ",")
+    """
+    use_grouping = settings.USE_L10N and settings.USE_THOUSAND_SEPARATOR
+    use_grouping = use_grouping or force_grouping
+    use_grouping = use_grouping and grouping != 0
+    # Make the common case fast
+    if isinstance(number, int) and not use_grouping and not decimal_pos:
+        return mark_safe(str(number))
+    # sign
+    sign = ''
+    if isinstance(number, Decimal):
+        str_number = '{:f}'.format(number)
+    else:
+        str_number = str(number)
+    if str_number[0] == '-':
+        sign = '-'
+        str_number = str_number[1:]
+    # decimal part
+    if '.' in str_number:
+        int_part, dec_part = str_number.split('.')
+        if decimal_pos is not None:
+            dec_part = dec_part[:decimal_pos]
+    else:
+        int_part, dec_part = str_number, ''
+    if decimal_pos is not None:
+        dec_part = dec_part + ('0' * (decimal_pos - len(dec_part)))
+    if dec_part:
+        dec_part = decimal_sep + dec_part
+    # grouping
+    if use_grouping:
+        try:
+            # if grouping is a sequence
+            intervals = list(grouping)
+        except TypeError:
+            # grouping is a single value
+            intervals = [grouping, 0]
+        active_interval = intervals.pop(0)
+        int_part_gd = ''
+        cnt = 0
+        for digit in int_part[::-1]:
+            if cnt and cnt == active_interval:
+                if intervals:
+                    active_interval = intervals.pop(0) or active_interval
+                int_part_gd += thousand_sep[::-1]
+                cnt = 0
+            int_part_gd += digit
+            cnt += 1
+        int_part = int_part_gd[::-1]
+    return sign + int_part + dec_part

flex/lib/python3.6/site-packages/django/utils/regex_helper.py

@@ -0,0 +1,344 @@
+"""
+Functions for reversing a regular expression (used in reverse URL resolving).
+Used internally by Django and not intended for external use.
+
+This is not, and is not intended to be, a complete reg-exp decompiler. It
+should be good enough for a large class of URLS, however.
+"""
+import warnings
+
+from django.utils.deprecation import RemovedInDjango21Warning
+
+# Mapping of an escape character to a representative of that class. So, e.g.,
+# "\w" is replaced by "x" in a reverse URL. A value of None means to ignore
+# this sequence. Any missing key is mapped to itself.
+ESCAPE_MAPPINGS = {
+    "A": None,
+    "b": None,
+    "B": None,
+    "d": "0",
+    "D": "x",
+    "s": " ",
+    "S": "x",
+    "w": "x",
+    "W": "!",
+    "Z": None,
+}
+
+
+class Choice(list):
+    """Represent multiple possibilities at this point in a pattern string."""
+
+
+class Group(list):
+    """Represent a capturing group in the pattern string."""
+
+
+class NonCapture(list):
+    """Represent a non-capturing group in the pattern string."""
+
+
+def normalize(pattern):
+    r"""
+    Given a reg-exp pattern, normalize it to an iterable of forms that
+    suffice for reverse matching. This does the following:
+
+    (1) For any repeating sections, keeps the minimum number of occurrences
+        permitted (this means zero for optional groups).
+    (2) If an optional group includes parameters, include one occurrence of
+        that group (along with the zero occurrence case from step (1)).
+    (3) Select the first (essentially an arbitrary) element from any character
+        class. Select an arbitrary character for any unordered class (e.g. '.'
+        or '\w') in the pattern.
+    (4) Ignore look-ahead and look-behind assertions.
+    (5) Raise an error on any disjunctive ('|') constructs.
+
+    Django's URLs for forward resolving are either all positional arguments or
+    all keyword arguments. That is assumed here, as well. Although reverse
+    resolving can be done using positional args when keyword args are
+    specified, the two cannot be mixed in the same reverse() call.
+    """
+    # Do a linear scan to work out the special features of this pattern. The
+    # idea is that we scan once here and collect all the information we need to
+    # make future decisions.
+    result = []
+    non_capturing_groups = []
+    consume_next = True
+    pattern_iter = next_char(iter(pattern))
+    num_args = 0
+
+    # A "while" loop is used here because later on we need to be able to peek
+    # at the next character and possibly go around without consuming another
+    # one at the top of the loop.
+    try:
+        ch, escaped = next(pattern_iter)
+    except StopIteration:
+        return [('', [])]
+
+    try:
+        while True:
+            if escaped:
+                result.append(ch)
+            elif ch == '.':
+                # Replace "any character" with an arbitrary representative.
+                result.append(".")
+            elif ch == '|':
+                # FIXME: One day we'll should do this, but not in 1.0.
+                raise NotImplementedError('Awaiting Implementation')
+            elif ch == "^":
+                pass
+            elif ch == '$':
+                break
+            elif ch == ')':
+                # This can only be the end of a non-capturing group, since all
+                # other unescaped parentheses are handled by the grouping
+                # section later (and the full group is handled there).
+                #
+                # We regroup everything inside the capturing group so that it
+                # can be quantified, if necessary.
+                start = non_capturing_groups.pop()
+                inner = NonCapture(result[start:])
+                result = result[:start] + [inner]
+            elif ch == '[':
+                # Replace ranges with the first character in the range.
+                ch, escaped = next(pattern_iter)
+                result.append(ch)
+                ch, escaped = next(pattern_iter)
+                while escaped or ch != ']':
+                    ch, escaped = next(pattern_iter)
+            elif ch == '(':
+                # Some kind of group.
+                ch, escaped = next(pattern_iter)
+                if ch != '?' or escaped:
+                    # A positional group
+                    name = "_%d" % num_args
+                    num_args += 1
+                    result.append(Group((("%%(%s)s" % name), name)))
+                    walk_to_end(ch, pattern_iter)
+                else:
+                    ch, escaped = next(pattern_iter)
+                    if ch in '!=<':
+                        # All of these are ignorable. Walk to the end of the
+                        # group.
+                        walk_to_end(ch, pattern_iter)
+                    elif ch in 'iLmsu#':
+                        warnings.warn(
+                            'Using (?%s) in url() patterns is deprecated.' % ch,
+                            RemovedInDjango21Warning
+                        )
+                        walk_to_end(ch, pattern_iter)
+                    elif ch == ':':
+                        # Non-capturing group
+                        non_capturing_groups.append(len(result))
+                    elif ch != 'P':
+                        # Anything else, other than a named group, is something
+                        # we cannot reverse.
+                        raise ValueError("Non-reversible reg-exp portion: '(?%s'" % ch)
+                    else:
+                        ch, escaped = next(pattern_iter)
+                        if ch not in ('<', '='):
+                            raise ValueError("Non-reversible reg-exp portion: '(?P%s'" % ch)
+                        # We are in a named capturing group. Extra the name and
+                        # then skip to the end.
+                        if ch == '<':
+                            terminal_char = '>'
+                        # We are in a named backreference.
+                        else:
+                            terminal_char = ')'
+                        name = []
+                        ch, escaped = next(pattern_iter)
+                        while ch != terminal_char:
+                            name.append(ch)
+                            ch, escaped = next(pattern_iter)
+                        param = ''.join(name)
+                        # Named backreferences have already consumed the
+                        # parenthesis.
+                        if terminal_char != ')':
+                            result.append(Group((("%%(%s)s" % param), param)))
+                            walk_to_end(ch, pattern_iter)
+                        else:
+                            result.append(Group((("%%(%s)s" % param), None)))
+            elif ch in "*?+{":
+                # Quantifiers affect the previous item in the result list.
+                count, ch = get_quantifier(ch, pattern_iter)
+                if ch:
+                    # We had to look ahead, but it wasn't need to compute the
+                    # quantifier, so use this character next time around the
+                    # main loop.
+                    consume_next = False
+
+                if count == 0:
+                    if contains(result[-1], Group):
+                        # If we are quantifying a capturing group (or
+                        # something containing such a group) and the minimum is
+                        # zero, we must also handle the case of one occurrence
+                        # being present. All the quantifiers (except {0,0},
+                        # which we conveniently ignore) that have a 0 minimum
+                        # also allow a single occurrence.
+                        result[-1] = Choice([None, result[-1]])
+                    else:
+                        result.pop()
+                elif count > 1:
+                    result.extend([result[-1]] * (count - 1))
+            else:
+                # Anything else is a literal.
+                result.append(ch)
+
+            if consume_next:
+                ch, escaped = next(pattern_iter)
+            else:
+                consume_next = True
+    except StopIteration:
+        pass
+    except NotImplementedError:
+        # A case of using the disjunctive form. No results for you!
+        return [('', [])]
+
+    return list(zip(*flatten_result(result)))
+
+
+def next_char(input_iter):
+    r"""
+    An iterator that yields the next character from "pattern_iter", respecting
+    escape sequences. An escaped character is replaced by a representative of
+    its class (e.g. \w -> "x"). If the escaped character is one that is
+    skipped, it is not returned (the next character is returned instead).
+
+    Yield the next character, along with a boolean indicating whether it is a
+    raw (unescaped) character or not.
+    """
+    for ch in input_iter:
+        if ch != '\\':
+            yield ch, False
+            continue
+        ch = next(input_iter)
+        representative = ESCAPE_MAPPINGS.get(ch, ch)
+        if representative is None:
+            continue
+        yield representative, True
+
+
+def walk_to_end(ch, input_iter):
+    """
+    The iterator is currently inside a capturing group. Walk to the close of
+    this group, skipping over any nested groups and handling escaped
+    parentheses correctly.
+    """
+    if ch == '(':
+        nesting = 1
+    else:
+        nesting = 0
+    for ch, escaped in input_iter:
+        if escaped:
+            continue
+        elif ch == '(':
+            nesting += 1
+        elif ch == ')':
+            if not nesting:
+                return
+            nesting -= 1
+
+
+def get_quantifier(ch, input_iter):
+    """
+    Parse a quantifier from the input, where "ch" is the first character in the
+    quantifier.
+
+    Return the minimum number of occurrences permitted by the quantifier and
+    either None or the next character from the input_iter if the next character
+    is not part of the quantifier.
+    """
+    if ch in '*?+':
+        try:
+            ch2, escaped = next(input_iter)
+        except StopIteration:
+            ch2 = None
+        if ch2 == '?':
+            ch2 = None
+        if ch == '+':
+            return 1, ch2
+        return 0, ch2
+
+    quant = []
+    while ch != '}':
+        ch, escaped = next(input_iter)
+        quant.append(ch)
+    quant = quant[:-1]
+    values = ''.join(quant).split(',')
+
+    # Consume the trailing '?', if necessary.
+    try:
+        ch, escaped = next(input_iter)
+    except StopIteration:
+        ch = None
+    if ch == '?':
+        ch = None
+    return int(values[0]), ch
+
+
+def contains(source, inst):
+    """
+    Return True if the "source" contains an instance of "inst". False,
+    otherwise.
+    """
+    if isinstance(source, inst):
+        return True
+    if isinstance(source, NonCapture):
+        for elt in source:
+            if contains(elt, inst):
+                return True
+    return False
+
+
+def flatten_result(source):
+    """
+    Turn the given source sequence into a list of reg-exp possibilities and
+    their arguments. Return a list of strings and a list of argument lists.
+    Each of the two lists will be of the same length.
+    """
+    if source is None:
+        return [''], [[]]
+    if isinstance(source, Group):
+        if source[1] is None:
+            params = []
+        else:
+            params = [source[1]]
+        return [source[0]], [params]
+    result = ['']
+    result_args = [[]]
+    pos = last = 0
+    for pos, elt in enumerate(source):
+        if isinstance(elt, str):
+            continue
+        piece = ''.join(source[last:pos])
+        if isinstance(elt, Group):
+            piece += elt[0]
+            param = elt[1]
+        else:
+            param = None
+        last = pos + 1
+        for i in range(len(result)):
+            result[i] += piece
+            if param:
+                result_args[i].append(param)
+        if isinstance(elt, (Choice, NonCapture)):
+            if isinstance(elt, NonCapture):
+                elt = [elt]
+            inner_result, inner_args = [], []
+            for item in elt:
+                res, args = flatten_result(item)
+                inner_result.extend(res)
+                inner_args.extend(args)
+            new_result = []
+            new_args = []
+            for item, args in zip(result, result_args):
+                for i_item, i_args in zip(inner_result, inner_args):
+                    new_result.append(item + i_item)
+                    new_args.append(args[:] + i_args)
+            result = new_result
+            result_args = new_args
+    if pos >= last:
+        piece = ''.join(source[last:])
+        for i in range(len(result)):
+            result[i] += piece
+    return result, result_args

flex/lib/python3.6/site-packages/django/utils/safestring.py

@@ -0,0 +1,86 @@
+"""
+Functions for working with "safe strings": strings that can be displayed safely
+without further escaping in HTML. Marking something as a "safe string" means
+that the producer of the string has already turned characters that should not
+be interpreted by the HTML engine (e.g. '<') into the appropriate entities.
+"""
+
+from django.utils.functional import Promise, wraps
+
+
+class SafeData:
+    def __html__(self):
+        """
+        Return the html representation of a string for interoperability.
+
+        This allows other template engines to understand Django's SafeData.
+        """
+        return self
+
+
+class SafeBytes(bytes, SafeData):
+    """
+    A bytes subclass that has been specifically marked as "safe" (requires no
+    further escaping) for HTML output purposes.
+
+    Kept in Django 2.0 for usage by apps supporting Python 2. Shouldn't be used
+    in Django anymore.
+    """
+    def __add__(self, rhs):
+        """
+        Concatenating a safe byte string with another safe byte string or safe
+        string is safe. Otherwise, the result is no longer safe.
+        """
+        t = super().__add__(rhs)
+        if isinstance(rhs, SafeText):
+            return SafeText(t)
+        elif isinstance(rhs, SafeBytes):
+            return SafeBytes(t)
+        return t
+
+
+class SafeText(str, SafeData):
+    """
+    A str subclass that has been specifically marked as "safe" for HTML output
+    purposes.
+    """
+    def __add__(self, rhs):
+        """
+        Concatenating a safe string with another safe byte string or
+        safe string is safe. Otherwise, the result is no longer safe.
+        """
+        t = super().__add__(rhs)
+        if isinstance(rhs, SafeData):
+            return SafeText(t)
+        return t
+
+    def __str__(self):
+        return self
+
+
+SafeString = SafeText
+
+
+def _safety_decorator(safety_marker, func):
+    @wraps(func)
+    def wrapped(*args, **kwargs):
+        return safety_marker(func(*args, **kwargs))
+    return wrapped
+
+
+def mark_safe(s):
+    """
+    Explicitly mark a string as safe for (HTML) output purposes. The returned
+    object can be used everywhere a string is appropriate.
+
+    If used on a method as a decorator, mark the returned data as safe.
+
+    Can be called multiple times on a single string.
+    """
+    if hasattr(s, '__html__'):
+        return s
+    if isinstance(s, (str, Promise)):
+        return SafeText(s)
+    if callable(s):
+        return _safety_decorator(mark_safe, s)
+    return SafeText(str(s))

flex/lib/python3.6/site-packages/django/utils/six.py

@@ -0,0 +1,882 @@
+"""Utilities for writing code that runs on Python 2 and 3"""
+
+# Copyright (c) 2010-2015 Benjamin Peterson
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
+import functools
+import itertools
+import operator
+import sys
+import types
+
+__author__ = "Benjamin Peterson <[email protected]>"
+__version__ = "1.10.0"
+
+
+# Useful for very coarse version differentiation.
+PY2 = sys.version_info[0] == 2
+PY3 = sys.version_info[0] == 3
+PY34 = sys.version_info[0:2] >= (3, 4)
+
+if PY3:
+    string_types = str,
+    integer_types = int,
+    class_types = type,
+    text_type = str
+    binary_type = bytes
+
+    MAXSIZE = sys.maxsize
+else:
+    string_types = basestring,
+    integer_types = (int, long)
+    class_types = (type, types.ClassType)
+    text_type = unicode
+    binary_type = str
+
+    if sys.platform.startswith("java"):
+        # Jython always uses 32 bits.
+        MAXSIZE = int((1 << 31) - 1)
+    else:
+        # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
+        class X:
+
+            def __len__(self):
+                return 1 << 31
+        try:
+            len(X())
+        except OverflowError:
+            # 32-bit
+            MAXSIZE = int((1 << 31) - 1)
+        else:
+            # 64-bit
+            MAXSIZE = int((1 << 63) - 1)
+        del X
+
+
+def _add_doc(func, doc):
+    """Add documentation to a function."""
+    func.__doc__ = doc
+
+
+def _import_module(name):
+    """Import module, returning the module after the last dot."""
+    __import__(name)
+    return sys.modules[name]
+
+
+class _LazyDescr:
+
+    def __init__(self, name):
+        self.name = name
+
+    def __get__(self, obj, tp):
+        result = self._resolve()
+        setattr(obj, self.name, result)  # Invokes __set__.
+        try:
+            # This is a bit ugly, but it avoids running this again by
+            # removing this descriptor.
+            delattr(obj.__class__, self.name)
+        except AttributeError:
+            pass
+        return result
+
+
+class MovedModule(_LazyDescr):
+
+    def __init__(self, name, old, new=None):
+        super().__init__(name)
+        if PY3:
+            if new is None:
+                new = name
+            self.mod = new
+        else:
+            self.mod = old
+
+    def _resolve(self):
+        return _import_module(self.mod)
+
+    def __getattr__(self, attr):
+        _module = self._resolve()
+        value = getattr(_module, attr)
+        setattr(self, attr, value)
+        return value
+
+
+class _LazyModule(types.ModuleType):
+
+    def __init__(self, name):
+        super().__init__(name)
+        self.__doc__ = self.__class__.__doc__
+
+    def __dir__(self):
+        attrs = ["__doc__", "__name__"]
+        attrs += [attr.name for attr in self._moved_attributes]
+        return attrs
+
+    # Subclasses should override this
+    _moved_attributes = []
+
+
+class MovedAttribute(_LazyDescr):
+
+    def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None):
+        super().__init__(name)
+        if PY3:
+            if new_mod is None:
+                new_mod = name
+            self.mod = new_mod
+            if new_attr is None:
+                if old_attr is None:
+                    new_attr = name
+                else:
+                    new_attr = old_attr
+            self.attr = new_attr
+        else:
+            self.mod = old_mod
+            if old_attr is None:
+                old_attr = name
+            self.attr = old_attr
+
+    def _resolve(self):
+        module = _import_module(self.mod)
+        return getattr(module, self.attr)
+
+
+class _SixMetaPathImporter:
+
+    """
+    A meta path importer to import six.moves and its submodules.
+
+    This class implements a PEP302 finder and loader. It should be compatible
+    with Python 2.5 and all existing versions of Python3
+    """
+
+    def __init__(self, six_module_name):
+        self.name = six_module_name
+        self.known_modules = {}
+
+    def _add_module(self, mod, *fullnames):
+        for fullname in fullnames:
+            self.known_modules[self.name + "." + fullname] = mod
+
+    def _get_module(self, fullname):
+        return self.known_modules[self.name + "." + fullname]
+
+    def find_module(self, fullname, path=None):
+        if fullname in self.known_modules:
+            return self
+        return None
+
+    def __get_module(self, fullname):
+        try:
+            return self.known_modules[fullname]
+        except KeyError:
+            raise ImportError("This loader does not know module " + fullname)
+
+    def load_module(self, fullname):
+        try:
+            # in case of a reload
+            return sys.modules[fullname]
+        except KeyError:
+            pass
+        mod = self.__get_module(fullname)
+        if isinstance(mod, MovedModule):
+            mod = mod._resolve()
+        else:
+            mod.__loader__ = self
+        sys.modules[fullname] = mod
+        return mod
+
+    def is_package(self, fullname):
+        """
+        Return true, if the named module is a package.
+
+        We need this method to get correct spec objects with
+        Python 3.4 (see PEP451)
+        """
+        return hasattr(self.__get_module(fullname), "__path__")
+
+    def get_code(self, fullname):
+        """Return None
+
+        Required, if is_package is implemented"""
+        self.__get_module(fullname)  # eventually raises ImportError
+        return None
+    get_source = get_code  # same as get_code
+
+_importer = _SixMetaPathImporter(__name__)
+
+
+class _MovedItems(_LazyModule):
+
+    """Lazy loading of moved objects"""
+    __path__ = []  # mark as package
+
+
+_moved_attributes = [
+    MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"),
+    MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"),
+    MovedAttribute("filterfalse", "itertools", "itertools", "ifilterfalse", "filterfalse"),
+    MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"),
+    MovedAttribute("intern", "__builtin__", "sys"),
+    MovedAttribute("map", "itertools", "builtins", "imap", "map"),
+    MovedAttribute("getcwd", "os", "os", "getcwdu", "getcwd"),
+    MovedAttribute("getcwdb", "os", "os", "getcwd", "getcwdb"),
+    MovedAttribute("range", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("reload_module", "__builtin__", "importlib" if PY34 else "imp", "reload"),
+    MovedAttribute("reduce", "__builtin__", "functools"),
+    MovedAttribute("shlex_quote", "pipes", "shlex", "quote"),
+    MovedAttribute("StringIO", "StringIO", "io"),
+    MovedAttribute("UserDict", "UserDict", "collections"),
+    MovedAttribute("UserList", "UserList", "collections"),
+    MovedAttribute("UserString", "UserString", "collections"),
+    MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"),
+    MovedAttribute("zip", "itertools", "builtins", "izip", "zip"),
+    MovedAttribute("zip_longest", "itertools", "itertools", "izip_longest", "zip_longest"),
+    MovedModule("builtins", "__builtin__"),
+    MovedModule("configparser", "ConfigParser"),
+    MovedModule("copyreg", "copy_reg"),
+    MovedModule("dbm_gnu", "gdbm", "dbm.gnu"),
+    MovedModule("_dummy_thread", "dummy_thread", "_dummy_thread"),
+    MovedModule("http_cookiejar", "cookielib", "http.cookiejar"),
+    MovedModule("http_cookies", "Cookie", "http.cookies"),
+    MovedModule("html_entities", "htmlentitydefs", "html.entities"),
+    MovedModule("html_parser", "HTMLParser", "html.parser"),
+    MovedModule("http_client", "httplib", "http.client"),
+    MovedModule("email_mime_multipart", "email.MIMEMultipart", "email.mime.multipart"),
+    MovedModule("email_mime_nonmultipart", "email.MIMENonMultipart", "email.mime.nonmultipart"),
+    MovedModule("email_mime_text", "email.MIMEText", "email.mime.text"),
+    MovedModule("email_mime_base", "email.MIMEBase", "email.mime.base"),
+    MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"),
+    MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"),
+    MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"),
+    MovedModule("cPickle", "cPickle", "pickle"),
+    MovedModule("queue", "Queue"),
+    MovedModule("reprlib", "repr"),
+    MovedModule("socketserver", "SocketServer"),
+    MovedModule("_thread", "thread", "_thread"),
+    MovedModule("tkinter", "Tkinter"),
+    MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"),
+    MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"),
+    MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"),
+    MovedModule("tkinter_tix", "Tix", "tkinter.tix"),
+    MovedModule("tkinter_ttk", "ttk", "tkinter.ttk"),
+    MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"),
+    MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"),
+    MovedModule("tkinter_colorchooser", "tkColorChooser",
+                "tkinter.colorchooser"),
+    MovedModule("tkinter_commondialog", "tkCommonDialog",
+                "tkinter.commondialog"),
+    MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"),
+    MovedModule("tkinter_font", "tkFont", "tkinter.font"),
+    MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"),
+    MovedModule("tkinter_tksimpledialog", "tkSimpleDialog",
+                "tkinter.simpledialog"),
+    MovedModule("urllib_parse", __name__ + ".moves.urllib_parse", "urllib.parse"),
+    MovedModule("urllib_error", __name__ + ".moves.urllib_error", "urllib.error"),
+    MovedModule("urllib", __name__ + ".moves.urllib", __name__ + ".moves.urllib"),
+    MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"),
+    MovedModule("xmlrpc_client", "xmlrpclib", "xmlrpc.client"),
+    MovedModule("xmlrpc_server", "SimpleXMLRPCServer", "xmlrpc.server"),
+]
+# Add windows specific modules.
+if sys.platform == "win32":
+    _moved_attributes += [
+        MovedModule("winreg", "_winreg"),
+    ]
+
+for attr in _moved_attributes:
+    setattr(_MovedItems, attr.name, attr)
+    if isinstance(attr, MovedModule):
+        _importer._add_module(attr, "moves." + attr.name)
+del attr
+
+_MovedItems._moved_attributes = _moved_attributes
+
+moves = _MovedItems(__name__ + ".moves")
+_importer._add_module(moves, "moves")
+
+
+class Module_six_moves_urllib_parse(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_parse"""
+
+
+_urllib_parse_moved_attributes = [
+    MovedAttribute("ParseResult", "urlparse", "urllib.parse"),
+    MovedAttribute("SplitResult", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qs", "urlparse", "urllib.parse"),
+    MovedAttribute("parse_qsl", "urlparse", "urllib.parse"),
+    MovedAttribute("urldefrag", "urlparse", "urllib.parse"),
+    MovedAttribute("urljoin", "urlparse", "urllib.parse"),
+    MovedAttribute("urlparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunparse", "urlparse", "urllib.parse"),
+    MovedAttribute("urlunsplit", "urlparse", "urllib.parse"),
+    MovedAttribute("quote", "urllib", "urllib.parse"),
+    MovedAttribute("quote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("unquote", "urllib", "urllib.parse"),
+    MovedAttribute("unquote_plus", "urllib", "urllib.parse"),
+    MovedAttribute("urlencode", "urllib", "urllib.parse"),
+    MovedAttribute("splitquery", "urllib", "urllib.parse"),
+    MovedAttribute("splittag", "urllib", "urllib.parse"),
+    MovedAttribute("splituser", "urllib", "urllib.parse"),
+    MovedAttribute("uses_fragment", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_netloc", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_params", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_query", "urlparse", "urllib.parse"),
+    MovedAttribute("uses_relative", "urlparse", "urllib.parse"),
+]
+for attr in _urllib_parse_moved_attributes:
+    setattr(Module_six_moves_urllib_parse, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_parse._moved_attributes = _urllib_parse_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_parse(__name__ + ".moves.urllib_parse"),
+                      "moves.urllib_parse", "moves.urllib.parse")
+
+
+class Module_six_moves_urllib_error(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_error"""
+
+
+_urllib_error_moved_attributes = [
+    MovedAttribute("URLError", "urllib2", "urllib.error"),
+    MovedAttribute("HTTPError", "urllib2", "urllib.error"),
+    MovedAttribute("ContentTooShortError", "urllib", "urllib.error"),
+]
+for attr in _urllib_error_moved_attributes:
+    setattr(Module_six_moves_urllib_error, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_error._moved_attributes = _urllib_error_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_error(__name__ + ".moves.urllib.error"),
+                      "moves.urllib_error", "moves.urllib.error")
+
+
+class Module_six_moves_urllib_request(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_request"""
+
+
+_urllib_request_moved_attributes = [
+    MovedAttribute("urlopen", "urllib2", "urllib.request"),
+    MovedAttribute("install_opener", "urllib2", "urllib.request"),
+    MovedAttribute("build_opener", "urllib2", "urllib.request"),
+    MovedAttribute("pathname2url", "urllib", "urllib.request"),
+    MovedAttribute("url2pathname", "urllib", "urllib.request"),
+    MovedAttribute("getproxies", "urllib", "urllib.request"),
+    MovedAttribute("Request", "urllib2", "urllib.request"),
+    MovedAttribute("OpenerDirector", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDefaultErrorHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPRedirectHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPCookieProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyHandler", "urllib2", "urllib.request"),
+    MovedAttribute("BaseHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgr", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPPasswordMgrWithDefaultRealm", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyBasicAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("AbstractDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("ProxyDigestAuthHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPSHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FileHandler", "urllib2", "urllib.request"),
+    MovedAttribute("FTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("CacheFTPHandler", "urllib2", "urllib.request"),
+    MovedAttribute("UnknownHandler", "urllib2", "urllib.request"),
+    MovedAttribute("HTTPErrorProcessor", "urllib2", "urllib.request"),
+    MovedAttribute("urlretrieve", "urllib", "urllib.request"),
+    MovedAttribute("urlcleanup", "urllib", "urllib.request"),
+    MovedAttribute("URLopener", "urllib", "urllib.request"),
+    MovedAttribute("FancyURLopener", "urllib", "urllib.request"),
+    MovedAttribute("proxy_bypass", "urllib", "urllib.request"),
+]
+for attr in _urllib_request_moved_attributes:
+    setattr(Module_six_moves_urllib_request, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_request._moved_attributes = _urllib_request_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_request(__name__ + ".moves.urllib.request"),
+                      "moves.urllib_request", "moves.urllib.request")
+
+
+class Module_six_moves_urllib_response(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_response"""
+
+
+_urllib_response_moved_attributes = [
+    MovedAttribute("addbase", "urllib", "urllib.response"),
+    MovedAttribute("addclosehook", "urllib", "urllib.response"),
+    MovedAttribute("addinfo", "urllib", "urllib.response"),
+    MovedAttribute("addinfourl", "urllib", "urllib.response"),
+]
+for attr in _urllib_response_moved_attributes:
+    setattr(Module_six_moves_urllib_response, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_response._moved_attributes = _urllib_response_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_response(__name__ + ".moves.urllib.response"),
+                      "moves.urllib_response", "moves.urllib.response")
+
+
+class Module_six_moves_urllib_robotparser(_LazyModule):
+
+    """Lazy loading of moved objects in six.moves.urllib_robotparser"""
+
+
+_urllib_robotparser_moved_attributes = [
+    MovedAttribute("RobotFileParser", "robotparser", "urllib.robotparser"),
+]
+for attr in _urllib_robotparser_moved_attributes:
+    setattr(Module_six_moves_urllib_robotparser, attr.name, attr)
+del attr
+
+Module_six_moves_urllib_robotparser._moved_attributes = _urllib_robotparser_moved_attributes
+
+_importer._add_module(Module_six_moves_urllib_robotparser(__name__ + ".moves.urllib.robotparser"),
+                      "moves.urllib_robotparser", "moves.urllib.robotparser")
+
+
+class Module_six_moves_urllib(types.ModuleType):
+
+    """Create a six.moves.urllib namespace that resembles the Python 3 namespace"""
+    __path__ = []  # mark as package
+    parse = _importer._get_module("moves.urllib_parse")
+    error = _importer._get_module("moves.urllib_error")
+    request = _importer._get_module("moves.urllib_request")
+    response = _importer._get_module("moves.urllib_response")
+    robotparser = _importer._get_module("moves.urllib_robotparser")
+
+    def __dir__(self):
+        return ['parse', 'error', 'request', 'response', 'robotparser']
+
+_importer._add_module(Module_six_moves_urllib(__name__ + ".moves.urllib"),
+                      "moves.urllib")
+
+
+def add_move(move):
+    """Add an item to six.moves."""
+    setattr(_MovedItems, move.name, move)
+
+
+def remove_move(name):
+    """Remove item from six.moves."""
+    try:
+        delattr(_MovedItems, name)
+    except AttributeError:
+        try:
+            del moves.__dict__[name]
+        except KeyError:
+            raise AttributeError("no such move, %r" % (name,))
+
+
+if PY3:
+    _meth_func = "__func__"
+    _meth_self = "__self__"
+
+    _func_closure = "__closure__"
+    _func_code = "__code__"
+    _func_defaults = "__defaults__"
+    _func_globals = "__globals__"
+else:
+    _meth_func = "im_func"
+    _meth_self = "im_self"
+
+    _func_closure = "func_closure"
+    _func_code = "func_code"
+    _func_defaults = "func_defaults"
+    _func_globals = "func_globals"
+
+
+try:
+    advance_iterator = next
+except NameError:
+    def advance_iterator(it):
+        return it.next()
+next = advance_iterator
+
+
+try:
+    callable = callable
+except NameError:
+    def callable(obj):
+        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
+
+
+if PY3:
+    def get_unbound_function(unbound):
+        return unbound
+
+    create_bound_method = types.MethodType
+
+    def create_unbound_method(func, cls):
+        return func
+
+    Iterator = object
+else:
+    def get_unbound_function(unbound):
+        return unbound.im_func
+
+    def create_bound_method(func, obj):
+        return types.MethodType(func, obj, obj.__class__)
+
+    def create_unbound_method(func, cls):
+        return types.MethodType(func, None, cls)
+
+    class Iterator:
+
+        def next(self):
+            return type(self).__next__(self)
+
+    callable = callable
+_add_doc(get_unbound_function,
+         """Get the function out of a possibly unbound function""")
+
+
+get_method_function = operator.attrgetter(_meth_func)
+get_method_self = operator.attrgetter(_meth_self)
+get_function_closure = operator.attrgetter(_func_closure)
+get_function_code = operator.attrgetter(_func_code)
+get_function_defaults = operator.attrgetter(_func_defaults)
+get_function_globals = operator.attrgetter(_func_globals)
+
+
+if PY3:
+    def iterkeys(d, **kw):
+        return iter(d.keys(**kw))
+
+    def itervalues(d, **kw):
+        return iter(d.values(**kw))
+
+    def iteritems(d, **kw):
+        return iter(d.items(**kw))
+
+    def iterlists(d, **kw):
+        return iter(d.lists(**kw))
+
+    viewkeys = operator.methodcaller("keys")
+
+    viewvalues = operator.methodcaller("values")
+
+    viewitems = operator.methodcaller("items")
+else:
+    def iterkeys(d, **kw):
+        return d.iterkeys(**kw)
+
+    def itervalues(d, **kw):
+        return d.itervalues(**kw)
+
+    def iteritems(d, **kw):
+        return d.iteritems(**kw)
+
+    def iterlists(d, **kw):
+        return d.iterlists(**kw)
+
+    viewkeys = operator.methodcaller("viewkeys")
+
+    viewvalues = operator.methodcaller("viewvalues")
+
+    viewitems = operator.methodcaller("viewitems")
+
+_add_doc(iterkeys, "Return an iterator over the keys of a dictionary.")
+_add_doc(itervalues, "Return an iterator over the values of a dictionary.")
+_add_doc(iteritems,
+         "Return an iterator over the (key, value) pairs of a dictionary.")
+_add_doc(iterlists,
+         "Return an iterator over the (key, [values]) pairs of a dictionary.")
+
+
+if PY3:
+    def b(s):
+        return s.encode("latin-1")
+
+    def u(s):
+        return s
+    unichr = chr
+    import struct
+    int2byte = struct.Struct(">B").pack
+    del struct
+    byte2int = operator.itemgetter(0)
+    indexbytes = operator.getitem
+    iterbytes = iter
+    import io
+    StringIO = io.StringIO
+    BytesIO = io.BytesIO
+    _assertCountEqual = "assertCountEqual"
+    if sys.version_info[1] <= 1:
+        _assertRaisesRegex = "assertRaisesRegexp"
+        _assertRegex = "assertRegexpMatches"
+    else:
+        _assertRaisesRegex = "assertRaisesRegex"
+        _assertRegex = "assertRegex"
+else:
+    def b(s):
+        return s
+    # Workaround for standalone backslash
+
+    def u(s):
+        return unicode(s.replace(r'\\', r'\\\\'), "unicode_escape")
+    unichr = unichr
+    int2byte = chr
+
+    def byte2int(bs):
+        return ord(bs[0])
+
+    def indexbytes(buf, i):
+        return ord(buf[i])
+    iterbytes = functools.partial(itertools.imap, ord)
+    import StringIO
+    StringIO = BytesIO = StringIO.StringIO
+    _assertCountEqual = "assertItemsEqual"
+    _assertRaisesRegex = "assertRaisesRegexp"
+    _assertRegex = "assertRegexpMatches"
+_add_doc(b, """Byte literal""")
+_add_doc(u, """Text literal""")
+
+
+def assertCountEqual(self, *args, **kwargs):
+    return getattr(self, _assertCountEqual)(*args, **kwargs)
+
+
+def assertRaisesRegex(self, *args, **kwargs):
+    return getattr(self, _assertRaisesRegex)(*args, **kwargs)
+
+
+def assertRegex(self, *args, **kwargs):
+    return getattr(self, _assertRegex)(*args, **kwargs)
+
+
+if PY3:
+    exec_ = getattr(moves.builtins, "exec")
+
+    def reraise(tp, value, tb=None):
+        if value is None:
+            value = tp()
+        if value.__traceback__ is not tb:
+            raise value.with_traceback(tb)
+        raise value
+
+else:
+    def exec_(_code_, _globs_=None, _locs_=None):
+        """Execute code in a namespace."""
+        if _globs_ is None:
+            frame = sys._getframe(1)
+            _globs_ = frame.f_globals
+            if _locs_ is None:
+                _locs_ = frame.f_locals
+            del frame
+        elif _locs_ is None:
+            _locs_ = _globs_
+        exec("""exec _code_ in _globs_, _locs_""")
+
+    exec_("""def reraise(tp, value, tb=None):
+    raise tp, value, tb
+""")
+
+
+if sys.version_info[:2] == (3, 2):
+    exec_("""def raise_from(value, from_value):
+    if from_value is None:
+        raise value
+    raise value from from_value
+""")
+elif sys.version_info[:2] > (3, 2):
+    exec_("""def raise_from(value, from_value):
+    raise value from from_value
+""")
+else:
+    def raise_from(value, from_value):
+        raise value
+
+
+print_ = getattr(moves.builtins, "print", None)
+if print_ is None:
+    def print_(*args, **kwargs):
+        """The new-style print function for Python 2.4 and 2.5."""
+        fp = kwargs.pop("file", sys.stdout)
+        if fp is None:
+            return
+
+        def write(data):
+            if not isinstance(data, basestring):
+                data = str(data)
+            # If the file has an encoding, encode unicode with it.
+            if (isinstance(fp, file) and
+                    isinstance(data, unicode) and
+                    fp.encoding is not None):
+                errors = getattr(fp, "errors", None)
+                if errors is None:
+                    errors = "strict"
+                data = data.encode(fp.encoding, errors)
+            fp.write(data)
+        want_unicode = False
+        sep = kwargs.pop("sep", None)
+        if sep is not None:
+            if isinstance(sep, unicode):
+                want_unicode = True
+            elif not isinstance(sep, str):
+                raise TypeError("sep must be None or a string")
+        end = kwargs.pop("end", None)
+        if end is not None:
+            if isinstance(end, unicode):
+                want_unicode = True
+            elif not isinstance(end, str):
+                raise TypeError("end must be None or a string")
+        if kwargs:
+            raise TypeError("invalid keyword arguments to print()")
+        if not want_unicode:
+            for arg in args:
+                if isinstance(arg, unicode):
+                    want_unicode = True
+                    break
+        if want_unicode:
+            newline = unicode("\n")
+            space = unicode(" ")
+        else:
+            newline = "\n"
+            space = " "
+        if sep is None:
+            sep = space
+        if end is None:
+            end = newline
+        for i, arg in enumerate(args):
+            if i:
+                write(sep)
+            write(arg)
+        write(end)
+if sys.version_info[:2] < (3, 3):
+    _print = print_
+
+    def print_(*args, **kwargs):
+        fp = kwargs.get("file", sys.stdout)
+        flush = kwargs.pop("flush", False)
+        _print(*args, **kwargs)
+        if flush and fp is not None:
+            fp.flush()
+
+_add_doc(reraise, """Reraise an exception.""")
+
+if sys.version_info[0:2] < (3, 4):
+    def wraps(wrapped, assigned=functools.WRAPPER_ASSIGNMENTS,
+              updated=functools.WRAPPER_UPDATES):
+        def wrapper(f):
+            f = functools.wraps(wrapped, assigned, updated)(f)
+            f.__wrapped__ = wrapped
+            return f
+        return wrapper
+else:
+    wraps = functools.wraps
+
+
+def with_metaclass(meta, *bases):
+    """Create a base class with a metaclass."""
+    # This requires a bit of explanation: the basic idea is to make a dummy
+    # metaclass for one level of class instantiation that replaces itself with
+    # the actual metaclass.
+    class metaclass(meta):
+
+        def __new__(cls, name, this_bases, d):
+            return meta(name, bases, d)
+    return type.__new__(metaclass, 'temporary_class', (), {})
+
+
+def add_metaclass(metaclass):
+    """Class decorator for creating a class with a metaclass."""
+    def wrapper(cls):
+        orig_vars = cls.__dict__.copy()
+        slots = orig_vars.get('__slots__')
+        if slots is not None:
+            if isinstance(slots, str):
+                slots = [slots]
+            for slots_var in slots:
+                orig_vars.pop(slots_var)
+        orig_vars.pop('__dict__', None)
+        orig_vars.pop('__weakref__', None)
+        return metaclass(cls.__name__, cls.__bases__, orig_vars)
+    return wrapper
+
+
+def python_2_unicode_compatible(klass):
+    """
+    A decorator that defines __unicode__ and __str__ methods under Python 2.
+    Under Python 3 it does nothing.
+
+    To support Python 2 and 3 with a single code base, define a __str__ method
+    returning text and apply this decorator to the class.
+    """
+    if PY2:
+        if '__str__' not in klass.__dict__:
+            raise ValueError("@python_2_unicode_compatible cannot be applied "
+                             "to %s because it doesn't define __str__()." %
+                             klass.__name__)
+        klass.__unicode__ = klass.__str__
+        klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
+    return klass
+
+
+# Complete the moves implementation.
+# This code is at the end of this module to speed up module loading.
+# Turn this module into a package.
+__path__ = []  # required for PEP 302 and PEP 451
+__package__ = __name__  # see PEP 366 @ReservedAssignment
+if globals().get("__spec__") is not None:
+    __spec__.submodule_search_locations = []  # PEP 451 @UndefinedVariable
+# Remove other six meta path importers, since they cause problems. This can
+# happen if six is removed from sys.modules and then reloaded. (Setuptools does
+# this for some reason.)
+if sys.meta_path:
+    for i, importer in enumerate(sys.meta_path):
+        # Here's some real nastiness: Another "instance" of the six module might
+        # be floating around. Therefore, we can't use isinstance() to check for
+        # the six meta path importer, since the other six instance will have
+        # inserted an importer with different class.
+        if (type(importer).__name__ == "_SixMetaPathImporter" and
+                importer.name == __name__):
+            del sys.meta_path[i]
+            break
+    del i, importer
+# Finally, add the importer to the meta path import hook.
+sys.meta_path.append(_importer)
+
+
+### Additional customizations for Django ###
+
+if PY3:
+    memoryview = memoryview
+    buffer_types = (bytes, bytearray, memoryview)
+else:
+    # memoryview and buffer are not strictly equivalent, but should be fine for
+    # django core usage (mainly BinaryField). However, Jython doesn't support
+    # buffer (see http://bugs.jython.org/issue1521), so we have to be careful.
+    if sys.platform.startswith('java'):
+        memoryview = memoryview
+    else:
+        memoryview = buffer
+    buffer_types = (bytearray, memoryview)

flex/lib/python3.6/site-packages/django/utils/synch.py

@@ -0,0 +1,90 @@
+"""
+Synchronization primitives:
+
+    - reader-writer lock (preference to writers)
+
+(Contributed to Django by [email protected])
+"""
+
+import contextlib
+import threading
+
+
+class RWLock:
+    """
+    Classic implementation of reader-writer lock with preference to writers.
+
+    Readers can access a resource simultaneously.
+    Writers get an exclusive access.
+
+    API is self-descriptive:
+        reader_enters()
+        reader_leaves()
+        writer_enters()
+        writer_leaves()
+    """
+    def __init__(self):
+        self.mutex = threading.RLock()
+        self.can_read = threading.Semaphore(0)
+        self.can_write = threading.Semaphore(0)
+        self.active_readers = 0
+        self.active_writers = 0
+        self.waiting_readers = 0
+        self.waiting_writers = 0
+
+    def reader_enters(self):
+        with self.mutex:
+            if self.active_writers == 0 and self.waiting_writers == 0:
+                self.active_readers += 1
+                self.can_read.release()
+            else:
+                self.waiting_readers += 1
+        self.can_read.acquire()
+
+    def reader_leaves(self):
+        with self.mutex:
+            self.active_readers -= 1
+            if self.active_readers == 0 and self.waiting_writers != 0:
+                self.active_writers += 1
+                self.waiting_writers -= 1
+                self.can_write.release()
+
+    @contextlib.contextmanager
+    def reader(self):
+        self.reader_enters()
+        try:
+            yield
+        finally:
+            self.reader_leaves()
+
+    def writer_enters(self):
+        with self.mutex:
+            if self.active_writers == 0 and self.waiting_writers == 0 and self.active_readers == 0:
+                self.active_writers += 1
+                self.can_write.release()
+            else:
+                self.waiting_writers += 1
+        self.can_write.acquire()
+
+    def writer_leaves(self):
+        with self.mutex:
+            self.active_writers -= 1
+            if self.waiting_writers != 0:
+                self.active_writers += 1
+                self.waiting_writers -= 1
+                self.can_write.release()
+            elif self.waiting_readers != 0:
+                t = self.waiting_readers
+                self.waiting_readers = 0
+                self.active_readers += t
+                while t > 0:
+                    self.can_read.release()
+                    t -= 1
+
+    @contextlib.contextmanager
+    def writer(self):
+        self.writer_enters()
+        try:
+            yield
+        finally:
+            self.writer_leaves()

flex/lib/python3.6/site-packages/django/utils/termcolors.py

@@ -0,0 +1,215 @@
+"""
+termcolors.py
+"""
+
+color_names = ('black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white')
+foreground = {color_names[x]: '3%s' % x for x in range(8)}
+background = {color_names[x]: '4%s' % x for x in range(8)}
+
+RESET = '0'
+opt_dict = {'bold': '1', 'underscore': '4', 'blink': '5', 'reverse': '7', 'conceal': '8'}
+
+
+def colorize(text='', opts=(), **kwargs):
+    """
+    Return your text, enclosed in ANSI graphics codes.
+
+    Depends on the keyword arguments 'fg' and 'bg', and the contents of
+    the opts tuple/list.
+
+    Return the RESET code if no parameters are given.
+
+    Valid colors:
+        'black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white'
+
+    Valid options:
+        'bold'
+        'underscore'
+        'blink'
+        'reverse'
+        'conceal'
+        'noreset' - string will not be auto-terminated with the RESET code
+
+    Examples:
+        colorize('hello', fg='red', bg='blue', opts=('blink',))
+        colorize()
+        colorize('goodbye', opts=('underscore',))
+        print(colorize('first line', fg='red', opts=('noreset',)))
+        print('this should be red too')
+        print(colorize('and so should this'))
+        print('this should not be red')
+    """
+    code_list = []
+    if text == '' and len(opts) == 1 and opts[0] == 'reset':
+        return '\x1b[%sm' % RESET
+    for k, v in kwargs.items():
+        if k == 'fg':
+            code_list.append(foreground[v])
+        elif k == 'bg':
+            code_list.append(background[v])
+    for o in opts:
+        if o in opt_dict:
+            code_list.append(opt_dict[o])
+    if 'noreset' not in opts:
+        text = '%s\x1b[%sm' % (text or '', RESET)
+    return '%s%s' % (('\x1b[%sm' % ';'.join(code_list)), text or '')
+
+
+def make_style(opts=(), **kwargs):
+    """
+    Return a function with default parameters for colorize()
+
+    Example:
+        bold_red = make_style(opts=('bold',), fg='red')
+        print(bold_red('hello'))
+        KEYWORD = make_style(fg='yellow')
+        COMMENT = make_style(fg='blue', opts=('bold',))
+    """
+    return lambda text: colorize(text, opts, **kwargs)
+
+
+NOCOLOR_PALETTE = 'nocolor'
+DARK_PALETTE = 'dark'
+LIGHT_PALETTE = 'light'
+
+PALETTES = {
+    NOCOLOR_PALETTE: {
+        'ERROR': {},
+        'SUCCESS': {},
+        'WARNING': {},
+        'NOTICE': {},
+        'SQL_FIELD': {},
+        'SQL_COLTYPE': {},
+        'SQL_KEYWORD': {},
+        'SQL_TABLE': {},
+        'HTTP_INFO': {},
+        'HTTP_SUCCESS': {},
+        'HTTP_REDIRECT': {},
+        'HTTP_NOT_MODIFIED': {},
+        'HTTP_BAD_REQUEST': {},
+        'HTTP_NOT_FOUND': {},
+        'HTTP_SERVER_ERROR': {},
+        'MIGRATE_HEADING': {},
+        'MIGRATE_LABEL': {},
+    },
+    DARK_PALETTE: {
+        'ERROR': {'fg': 'red', 'opts': ('bold',)},
+        'SUCCESS': {'fg': 'green', 'opts': ('bold',)},
+        'WARNING': {'fg': 'yellow', 'opts': ('bold',)},
+        'NOTICE': {'fg': 'red'},
+        'SQL_FIELD': {'fg': 'green', 'opts': ('bold',)},
+        'SQL_COLTYPE': {'fg': 'green'},
+        'SQL_KEYWORD': {'fg': 'yellow'},
+        'SQL_TABLE': {'opts': ('bold',)},
+        'HTTP_INFO': {'opts': ('bold',)},
+        'HTTP_SUCCESS': {},
+        'HTTP_REDIRECT': {'fg': 'green'},
+        'HTTP_NOT_MODIFIED': {'fg': 'cyan'},
+        'HTTP_BAD_REQUEST': {'fg': 'red', 'opts': ('bold',)},
+        'HTTP_NOT_FOUND': {'fg': 'yellow'},
+        'HTTP_SERVER_ERROR': {'fg': 'magenta', 'opts': ('bold',)},
+        'MIGRATE_HEADING': {'fg': 'cyan', 'opts': ('bold',)},
+        'MIGRATE_LABEL': {'opts': ('bold',)},
+    },
+    LIGHT_PALETTE: {
+        'ERROR': {'fg': 'red', 'opts': ('bold',)},
+        'SUCCESS': {'fg': 'green', 'opts': ('bold',)},
+        'WARNING': {'fg': 'yellow', 'opts': ('bold',)},
+        'NOTICE': {'fg': 'red'},
+        'SQL_FIELD': {'fg': 'green', 'opts': ('bold',)},
+        'SQL_COLTYPE': {'fg': 'green'},
+        'SQL_KEYWORD': {'fg': 'blue'},
+        'SQL_TABLE': {'opts': ('bold',)},
+        'HTTP_INFO': {'opts': ('bold',)},
+        'HTTP_SUCCESS': {},
+        'HTTP_REDIRECT': {'fg': 'green', 'opts': ('bold',)},
+        'HTTP_NOT_MODIFIED': {'fg': 'green'},
+        'HTTP_BAD_REQUEST': {'fg': 'red', 'opts': ('bold',)},
+        'HTTP_NOT_FOUND': {'fg': 'red'},
+        'HTTP_SERVER_ERROR': {'fg': 'magenta', 'opts': ('bold',)},
+        'MIGRATE_HEADING': {'fg': 'cyan', 'opts': ('bold',)},
+        'MIGRATE_LABEL': {'opts': ('bold',)},
+    }
+}
+DEFAULT_PALETTE = DARK_PALETTE
+
+
+def parse_color_setting(config_string):
+    """Parse a DJANGO_COLORS environment variable to produce the system palette
+
+    The general form of a palette definition is:
+
+        "palette;role=fg;role=fg/bg;role=fg,option,option;role=fg/bg,option,option"
+
+    where:
+        palette is a named palette; one of 'light', 'dark', or 'nocolor'.
+        role is a named style used by Django
+        fg is a background color.
+        bg is a background color.
+        option is a display options.
+
+    Specifying a named palette is the same as manually specifying the individual
+    definitions for each role. Any individual definitions following the palette
+    definition will augment the base palette definition.
+
+    Valid roles:
+        'error', 'success', 'warning', 'notice', 'sql_field', 'sql_coltype',
+        'sql_keyword', 'sql_table', 'http_info', 'http_success',
+        'http_redirect', 'http_not_modified', 'http_bad_request',
+        'http_not_found', 'http_server_error', 'migrate_heading',
+        'migrate_label'
+
+    Valid colors:
+        'black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white'
+
+    Valid options:
+        'bold', 'underscore', 'blink', 'reverse', 'conceal', 'noreset'
+    """
+    if not config_string:
+        return PALETTES[DEFAULT_PALETTE]
+
+    # Split the color configuration into parts
+    parts = config_string.lower().split(';')
+    palette = PALETTES[NOCOLOR_PALETTE].copy()
+    for part in parts:
+        if part in PALETTES:
+            # A default palette has been specified
+            palette.update(PALETTES[part])
+        elif '=' in part:
+            # Process a palette defining string
+            definition = {}
+
+            # Break the definition into the role,
+            # plus the list of specific instructions.
+            # The role must be in upper case
+            role, instructions = part.split('=')
+            role = role.upper()
+
+            styles = instructions.split(',')
+            styles.reverse()
+
+            # The first instruction can contain a slash
+            # to break apart fg/bg.
+            colors = styles.pop().split('/')
+            colors.reverse()
+            fg = colors.pop()
+            if fg in color_names:
+                definition['fg'] = fg
+            if colors and colors[-1] in color_names:
+                definition['bg'] = colors[-1]
+
+            # All remaining instructions are options
+            opts = tuple(s for s in styles if s in opt_dict)
+            if opts:
+                definition['opts'] = opts
+
+            # The nocolor palette has all available roles.
+            # Use that palette as the basis for determining
+            # if the role is valid.
+            if role in PALETTES[NOCOLOR_PALETTE] and definition:
+                palette[role] = definition
+
+    # If there are no colors specified, return the empty palette.
+    if palette == PALETTES[NOCOLOR_PALETTE]:
+        return None
+    return palette

flex/lib/python3.6/site-packages/django/utils/text.py

@@ -0,0 +1,433 @@
+import html.entities
+import re
+import unicodedata
+from gzip import GzipFile
+from io import BytesIO
+
+from django.utils.functional import (
+    SimpleLazyObject, keep_lazy, keep_lazy_text, lazy,
+)
+from django.utils.safestring import SafeText, mark_safe
+from django.utils.translation import gettext as _, gettext_lazy, pgettext
+
+
+@keep_lazy_text
+def capfirst(x):
+    """Capitalize the first letter of a string."""
+    return x and str(x)[0].upper() + str(x)[1:]
+
+
+# Set up regular expressions
+re_words = re.compile(r'<.*?>|((?:\w[-\w]*|&.*?;)+)', re.S)
+re_chars = re.compile(r'<.*?>|(.)', re.S)
+re_tag = re.compile(r'<(/)?([^ ]+?)(?:(\s*/)| .*?)?>', re.S)
+re_newlines = re.compile(r'\r\n|\r')  # Used in normalize_newlines
+re_camel_case = re.compile(r'(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))')
+
+
+@keep_lazy_text
+def wrap(text, width):
+    """
+    A word-wrap function that preserves existing line breaks. Expects that
+    existing line breaks are posix newlines.
+
+    Preserve all white space except added line breaks consume the space on
+    which they break the line.
+
+    Don't wrap long words, thus the output text may have lines longer than
+    ``width``.
+    """
+    def _generator():
+        for line in text.splitlines(True):  # True keeps trailing linebreaks
+            max_width = min((line.endswith('\n') and width + 1 or width), width)
+            while len(line) > max_width:
+                space = line[:max_width + 1].rfind(' ') + 1
+                if space == 0:
+                    space = line.find(' ') + 1
+                    if space == 0:
+                        yield line
+                        line = ''
+                        break
+                yield '%s\n' % line[:space - 1]
+                line = line[space:]
+                max_width = min((line.endswith('\n') and width + 1 or width), width)
+            if line:
+                yield line
+    return ''.join(_generator())
+
+
+class Truncator(SimpleLazyObject):
+    """
+    An object used to truncate text, either by characters or words.
+    """
+    def __init__(self, text):
+        super().__init__(lambda: str(text))
+
+    def add_truncation_text(self, text, truncate=None):
+        if truncate is None:
+            truncate = pgettext(
+                'String to return when truncating text',
+                '%(truncated_text)s...')
+        if '%(truncated_text)s' in truncate:
+            return truncate % {'truncated_text': text}
+        # The truncation text didn't contain the %(truncated_text)s string
+        # replacement argument so just append it to the text.
+        if text.endswith(truncate):
+            # But don't append the truncation text if the current text already
+            # ends in this.
+            return text
+        return '%s%s' % (text, truncate)
+
+    def chars(self, num, truncate=None, html=False):
+        """
+        Return the text truncated to be no longer than the specified number
+        of characters.
+
+        `truncate` specifies what should be used to notify that the string has
+        been truncated, defaulting to a translatable string of an ellipsis
+        (...).
+        """
+        self._setup()
+        length = int(num)
+        text = unicodedata.normalize('NFC', self._wrapped)
+
+        # Calculate the length to truncate to (max length - end_text length)
+        truncate_len = length
+        for char in self.add_truncation_text('', truncate):
+            if not unicodedata.combining(char):
+                truncate_len -= 1
+                if truncate_len == 0:
+                    break
+        if html:
+            return self._truncate_html(length, truncate, text, truncate_len, False)
+        return self._text_chars(length, truncate, text, truncate_len)
+
+    def _text_chars(self, length, truncate, text, truncate_len):
+        """Truncate a string after a certain number of chars."""
+        s_len = 0
+        end_index = None
+        for i, char in enumerate(text):
+            if unicodedata.combining(char):
+                # Don't consider combining characters
+                # as adding to the string length
+                continue
+            s_len += 1
+            if end_index is None and s_len > truncate_len:
+                end_index = i
+            if s_len > length:
+                # Return the truncated string
+                return self.add_truncation_text(text[:end_index or 0],
+                                                truncate)
+
+        # Return the original string since no truncation was necessary
+        return text
+
+    def words(self, num, truncate=None, html=False):
+        """
+        Truncate a string after a certain number of words. `truncate` specifies
+        what should be used to notify that the string has been truncated,
+        defaulting to ellipsis (...).
+        """
+        self._setup()
+        length = int(num)
+        if html:
+            return self._truncate_html(length, truncate, self._wrapped, length, True)
+        return self._text_words(length, truncate)
+
+    def _text_words(self, length, truncate):
+        """
+        Truncate a string after a certain number of words.
+
+        Strip newlines in the string.
+        """
+        words = self._wrapped.split()
+        if len(words) > length:
+            words = words[:length]
+            return self.add_truncation_text(' '.join(words), truncate)
+        return ' '.join(words)
+
+    def _truncate_html(self, length, truncate, text, truncate_len, words):
+        """
+        Truncate HTML to a certain number of chars (not counting tags and
+        comments), or, if words is True, then to a certain number of words.
+        Close opened tags if they were correctly closed in the given HTML.
+
+        Preserve newlines in the HTML.
+        """
+        if words and length <= 0:
+            return ''
+
+        html4_singlets = (
+            'br', 'col', 'link', 'base', 'img',
+            'param', 'area', 'hr', 'input'
+        )
+
+        # Count non-HTML chars/words and keep note of open tags
+        pos = 0
+        end_text_pos = 0
+        current_len = 0
+        open_tags = []
+
+        regex = re_words if words else re_chars
+
+        while current_len <= length:
+            m = regex.search(text, pos)
+            if not m:
+                # Checked through whole string
+                break
+            pos = m.end(0)
+            if m.group(1):
+                # It's an actual non-HTML word or char
+                current_len += 1
+                if current_len == truncate_len:
+                    end_text_pos = pos
+                continue
+            # Check for tag
+            tag = re_tag.match(m.group(0))
+            if not tag or current_len >= truncate_len:
+                # Don't worry about non tags or tags after our truncate point
+                continue
+            closing_tag, tagname, self_closing = tag.groups()
+            # Element names are always case-insensitive
+            tagname = tagname.lower()
+            if self_closing or tagname in html4_singlets:
+                pass
+            elif closing_tag:
+                # Check for match in open tags list
+                try:
+                    i = open_tags.index(tagname)
+                except ValueError:
+                    pass
+                else:
+                    # SGML: An end tag closes, back to the matching start tag,
+                    # all unclosed intervening start tags with omitted end tags
+                    open_tags = open_tags[i + 1:]
+            else:
+                # Add it to the start of the open tags list
+                open_tags.insert(0, tagname)
+
+        if current_len <= length:
+            return text
+        out = text[:end_text_pos]
+        truncate_text = self.add_truncation_text('', truncate)
+        if truncate_text:
+            out += truncate_text
+        # Close any tags still open
+        for tag in open_tags:
+            out += '</%s>' % tag
+        # Return string
+        return out
+
+
+@keep_lazy_text
+def get_valid_filename(s):
+    """
+    Return the given string converted to a string that can be used for a clean
+    filename. Remove leading and trailing spaces; convert other spaces to
+    underscores; and remove anything that is not an alphanumeric, dash,
+    underscore, or dot.
+    >>> get_valid_filename("john's portrait in 2004.jpg")
+    'johns_portrait_in_2004.jpg'
+    """
+    s = str(s).strip().replace(' ', '_')
+    return re.sub(r'(?u)[^-\w.]', '', s)
+
+
+@keep_lazy_text
+def get_text_list(list_, last_word=gettext_lazy('or')):
+    """
+    >>> get_text_list(['a', 'b', 'c', 'd'])
+    'a, b, c or d'
+    >>> get_text_list(['a', 'b', 'c'], 'and')
+    'a, b and c'
+    >>> get_text_list(['a', 'b'], 'and')
+    'a and b'
+    >>> get_text_list(['a'])
+    'a'
+    >>> get_text_list([])
+    ''
+    """
+    if len(list_) == 0:
+        return ''
+    if len(list_) == 1:
+        return str(list_[0])
+    return '%s %s %s' % (
+        # Translators: This string is used as a separator between list elements
+        _(', ').join(str(i) for i in list_[:-1]), str(last_word), str(list_[-1])
+    )
+
+
+@keep_lazy_text
+def normalize_newlines(text):
+    """Normalize CRLF and CR newlines to just LF."""
+    return re_newlines.sub('\n', str(text))
+
+
+@keep_lazy_text
+def phone2numeric(phone):
+    """Convert a phone number with letters into its numeric equivalent."""
+    char2number = {
+        'a': '2', 'b': '2', 'c': '2', 'd': '3', 'e': '3', 'f': '3', 'g': '4',
+        'h': '4', 'i': '4', 'j': '5', 'k': '5', 'l': '5', 'm': '6', 'n': '6',
+        'o': '6', 'p': '7', 'q': '7', 'r': '7', 's': '7', 't': '8', 'u': '8',
+        'v': '8', 'w': '9', 'x': '9', 'y': '9', 'z': '9',
+    }
+    return ''.join(char2number.get(c, c) for c in phone.lower())
+
+
+# From http://www.xhaus.com/alan/python/httpcomp.html#gzip
+# Used with permission.
+def compress_string(s):
+    zbuf = BytesIO()
+    with GzipFile(mode='wb', compresslevel=6, fileobj=zbuf, mtime=0) as zfile:
+        zfile.write(s)
+    return zbuf.getvalue()
+
+
+class StreamingBuffer:
+    def __init__(self):
+        self.vals = []
+
+    def write(self, val):
+        self.vals.append(val)
+
+    def read(self):
+        if not self.vals:
+            return b''
+        ret = b''.join(self.vals)
+        self.vals = []
+        return ret
+
+    def flush(self):
+        return
+
+    def close(self):
+        return
+
+
+# Like compress_string, but for iterators of strings.
+def compress_sequence(sequence):
+    buf = StreamingBuffer()
+    with GzipFile(mode='wb', compresslevel=6, fileobj=buf, mtime=0) as zfile:
+        # Output headers...
+        yield buf.read()
+        for item in sequence:
+            zfile.write(item)
+            data = buf.read()
+            if data:
+                yield data
+    yield buf.read()
+
+
+# Expression to match some_token and some_token="with spaces" (and similarly
+# for single-quoted strings).
+smart_split_re = re.compile(r"""
+    ((?:
+        [^\s'"]*
+        (?:
+            (?:"(?:[^"\\]|\\.)*" | '(?:[^'\\]|\\.)*')
+            [^\s'"]*
+        )+
+    ) | \S+)
+""", re.VERBOSE)
+
+
+def smart_split(text):
+    r"""
+    Generator that splits a string by spaces, leaving quoted phrases together.
+    Supports both single and double quotes, and supports escaping quotes with
+    backslashes. In the output, strings will keep their initial and trailing
+    quote marks and escaped quotes will remain escaped (the results can then
+    be further processed with unescape_string_literal()).
+
+    >>> list(smart_split(r'This is "a person\'s" test.'))
+    ['This', 'is', '"a person\\\'s"', 'test.']
+    >>> list(smart_split(r"Another 'person\'s' test."))
+    ['Another', "'person\\'s'", 'test.']
+    >>> list(smart_split(r'A "\"funky\" style" test.'))
+    ['A', '"\\"funky\\" style"', 'test.']
+    """
+    for bit in smart_split_re.finditer(str(text)):
+        yield bit.group(0)
+
+
+def _replace_entity(match):
+    text = match.group(1)
+    if text[0] == '#':
+        text = text[1:]
+        try:
+            if text[0] in 'xX':
+                c = int(text[1:], 16)
+            else:
+                c = int(text)
+            return chr(c)
+        except ValueError:
+            return match.group(0)
+    else:
+        try:
+            return chr(html.entities.name2codepoint[text])
+        except (ValueError, KeyError):
+            return match.group(0)
+
+
+_entity_re = re.compile(r"&(#?[xX]?(?:[0-9a-fA-F]+|\w{1,8}));")
+
+
+@keep_lazy_text
+def unescape_entities(text):
+    return _entity_re.sub(_replace_entity, str(text))
+
+
+@keep_lazy_text
+def unescape_string_literal(s):
+    r"""
+    Convert quoted string literals to unquoted strings with escaped quotes and
+    backslashes unquoted::
+
+        >>> unescape_string_literal('"abc"')
+        'abc'
+        >>> unescape_string_literal("'abc'")
+        'abc'
+        >>> unescape_string_literal('"a \"bc\""')
+        'a "bc"'
+        >>> unescape_string_literal("'\'ab\' c'")
+        "'ab' c"
+    """
+    if s[0] not in "\"'" or s[-1] != s[0]:
+        raise ValueError("Not a string literal: %r" % s)
+    quote = s[0]
+    return s[1:-1].replace(r'\%s' % quote, quote).replace(r'\\', '\\')
+
+
+@keep_lazy(str, SafeText)
+def slugify(value, allow_unicode=False):
+    """
+    Convert to ASCII if 'allow_unicode' is False. Convert spaces to hyphens.
+    Remove characters that aren't alphanumerics, underscores, or hyphens.
+    Convert to lowercase. Also strip leading and trailing whitespace.
+    """
+    value = str(value)
+    if allow_unicode:
+        value = unicodedata.normalize('NFKC', value)
+    else:
+        value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore').decode('ascii')
+    value = re.sub(r'[^\w\s-]', '', value).strip().lower()
+    return mark_safe(re.sub(r'[-\s]+', '-', value))
+
+
+def camel_case_to_spaces(value):
+    """
+    Split CamelCase and convert to lower case. Strip surrounding whitespace.
+    """
+    return re_camel_case.sub(r' \1', value).strip().lower()
+
+
+def _format_lazy(format_string, *args, **kwargs):
+    """
+    Apply str.format() on 'format_string' where format_string, args,
+    and/or kwargs might be lazy.
+    """
+    return format_string.format(*args, **kwargs)
+
+
+format_lazy = lazy(_format_lazy, str)

flex/lib/python3.6/site-packages/django/utils/timesince.py

@@ -0,0 +1,77 @@
+import calendar
+import datetime
+
+from django.utils.html import avoid_wrapping
+from django.utils.timezone import is_aware, utc
+from django.utils.translation import gettext, ngettext_lazy
+
+TIMESINCE_CHUNKS = (
+    (60 * 60 * 24 * 365, ngettext_lazy('%d year', '%d years')),
+    (60 * 60 * 24 * 30, ngettext_lazy('%d month', '%d months')),
+    (60 * 60 * 24 * 7, ngettext_lazy('%d week', '%d weeks')),
+    (60 * 60 * 24, ngettext_lazy('%d day', '%d days')),
+    (60 * 60, ngettext_lazy('%d hour', '%d hours')),
+    (60, ngettext_lazy('%d minute', '%d minutes'))
+)
+
+
+def timesince(d, now=None, reversed=False):
+    """
+    Take two datetime objects and return the time between d and now as a nicely
+    formatted string, e.g. "10 minutes". If d occurs after now, return
+    "0 minutes".
+
+    Units used are years, months, weeks, days, hours, and minutes.
+    Seconds and microseconds are ignored.  Up to two adjacent units will be
+    displayed.  For example, "2 weeks, 3 days" and "1 year, 3 months" are
+    possible outputs, but "2 weeks, 3 hours" and "1 year, 5 days" are not.
+
+    Adapted from
+    http://web.archive.org/web/20060617175230/http://blog.natbat.co.uk/archive/2003/Jun/14/time_since
+    """
+    # Convert datetime.date to datetime.datetime for comparison.
+    if not isinstance(d, datetime.datetime):
+        d = datetime.datetime(d.year, d.month, d.day)
+    if now and not isinstance(now, datetime.datetime):
+        now = datetime.datetime(now.year, now.month, now.day)
+
+    if not now:
+        now = datetime.datetime.now(utc if is_aware(d) else None)
+
+    if reversed:
+        d, now = now, d
+    delta = now - d
+
+    # Deal with leapyears by subtracing the number of leapdays
+    leapdays = calendar.leapdays(d.year, now.year)
+    if leapdays != 0:
+        if calendar.isleap(d.year):
+            leapdays -= 1
+        elif calendar.isleap(now.year):
+            leapdays += 1
+    delta -= datetime.timedelta(leapdays)
+
+    # ignore microseconds
+    since = delta.days * 24 * 60 * 60 + delta.seconds
+    if since <= 0:
+        # d is in the future compared to now, stop processing.
+        return avoid_wrapping(gettext('0 minutes'))
+    for i, (seconds, name) in enumerate(TIMESINCE_CHUNKS):
+        count = since // seconds
+        if count != 0:
+            break
+    result = avoid_wrapping(name % count)
+    if i + 1 < len(TIMESINCE_CHUNKS):
+        # Now get the second item
+        seconds2, name2 = TIMESINCE_CHUNKS[i + 1]
+        count2 = (since - (seconds * count)) // seconds2
+        if count2 != 0:
+            result += gettext(', ') + avoid_wrapping(name2 % count2)
+    return result
+
+
+def timeuntil(d, now=None):
+    """
+    Like timesince, but return a string measuring the time until the given time.
+    """
+    return timesince(d, now, reversed=True)

flex/lib/python3.6/site-packages/django/utils/timezone.py

@@ -0,0 +1,286 @@
+"""
+Timezone-related classes and functions.
+"""
+
+import functools
+from contextlib import ContextDecorator
+from datetime import datetime, timedelta, tzinfo
+from threading import local
+
+import pytz
+
+from django.conf import settings
+
+__all__ = [
+    'utc', 'get_fixed_timezone',
+    'get_default_timezone', 'get_default_timezone_name',
+    'get_current_timezone', 'get_current_timezone_name',
+    'activate', 'deactivate', 'override',
+    'localtime', 'now',
+    'is_aware', 'is_naive', 'make_aware', 'make_naive',
+]
+
+
+# UTC and local time zones
+
+ZERO = timedelta(0)
+
+
+class FixedOffset(tzinfo):
+    """
+    Fixed offset in minutes east from UTC. Taken from Python's docs.
+
+    Kept as close as possible to the reference version. __init__ was changed
+    to make its arguments optional, according to Python's requirement that
+    tzinfo subclasses can be instantiated without arguments.
+    """
+
+    def __init__(self, offset=None, name=None):
+        if offset is not None:
+            self.__offset = timedelta(minutes=offset)
+        if name is not None:
+            self.__name = name
+
+    def utcoffset(self, dt):
+        return self.__offset
+
+    def tzname(self, dt):
+        return self.__name
+
+    def dst(self, dt):
+        return ZERO
+
+
+# UTC time zone as a tzinfo instance.
+utc = pytz.utc
+
+
+def get_fixed_timezone(offset):
+    """Return a tzinfo instance with a fixed offset from UTC."""
+    if isinstance(offset, timedelta):
+        offset = offset.seconds // 60
+    sign = '-' if offset < 0 else '+'
+    hhmm = '%02d%02d' % divmod(abs(offset), 60)
+    name = sign + hhmm
+    return FixedOffset(offset, name)
+
+
+# In order to avoid accessing settings at compile time,
+# wrap the logic in a function and cache the result.
+@functools.lru_cache()
+def get_default_timezone():
+    """
+    Return the default time zone as a tzinfo instance.
+
+    This is the time zone defined by settings.TIME_ZONE.
+    """
+    return pytz.timezone(settings.TIME_ZONE)
+
+
+# This function exists for consistency with get_current_timezone_name
+def get_default_timezone_name():
+    """Return the name of the default time zone."""
+    return _get_timezone_name(get_default_timezone())
+
+
+_active = local()
+
+
+def get_current_timezone():
+    """Return the currently active time zone as a tzinfo instance."""
+    return getattr(_active, "value", get_default_timezone())
+
+
+def get_current_timezone_name():
+    """Return the name of the currently active time zone."""
+    return _get_timezone_name(get_current_timezone())
+
+
+def _get_timezone_name(timezone):
+    """Return the name of ``timezone``."""
+    try:
+        # for pytz timezones
+        return timezone.zone
+    except AttributeError:
+        # for regular tzinfo objects
+        return timezone.tzname(None)
+
+# Timezone selection functions.
+
+# These functions don't change os.environ['TZ'] and call time.tzset()
+# because it isn't thread safe.
+
+
+def activate(timezone):
+    """
+    Set the time zone for the current thread.
+
+    The ``timezone`` argument must be an instance of a tzinfo subclass or a
+    time zone name.
+    """
+    if isinstance(timezone, tzinfo):
+        _active.value = timezone
+    elif isinstance(timezone, str):
+        _active.value = pytz.timezone(timezone)
+    else:
+        raise ValueError("Invalid timezone: %r" % timezone)
+
+
+def deactivate():
+    """
+    Unset the time zone for the current thread.
+
+    Django will then use the time zone defined by settings.TIME_ZONE.
+    """
+    if hasattr(_active, "value"):
+        del _active.value
+
+
+class override(ContextDecorator):
+    """
+    Temporarily set the time zone for the current thread.
+
+    This is a context manager that uses django.utils.timezone.activate()
+    to set the timezone on entry and restores the previously active timezone
+    on exit.
+
+    The ``timezone`` argument must be an instance of a ``tzinfo`` subclass, a
+    time zone name, or ``None``. If it is ``None``, Django enables the default
+    time zone.
+    """
+    def __init__(self, timezone):
+        self.timezone = timezone
+
+    def __enter__(self):
+        self.old_timezone = getattr(_active, 'value', None)
+        if self.timezone is None:
+            deactivate()
+        else:
+            activate(self.timezone)
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.old_timezone is None:
+            deactivate()
+        else:
+            _active.value = self.old_timezone
+
+
+# Templates
+
+def template_localtime(value, use_tz=None):
+    """
+    Check if value is a datetime and converts it to local time if necessary.
+
+    If use_tz is provided and is not None, that will force the value to
+    be converted (or not), overriding the value of settings.USE_TZ.
+
+    This function is designed for use by the template engine.
+    """
+    should_convert = (
+        isinstance(value, datetime) and
+        (settings.USE_TZ if use_tz is None else use_tz) and
+        not is_naive(value) and
+        getattr(value, 'convert_to_local_time', True)
+    )
+    return localtime(value) if should_convert else value
+
+
+# Utilities
+
+def localtime(value=None, timezone=None):
+    """
+    Convert an aware datetime.datetime to local time.
+
+    Only aware datetimes are allowed. When value is omitted, it defaults to
+    now().
+
+    Local time is defined by the current time zone, unless another time zone
+    is specified.
+    """
+    if value is None:
+        value = now()
+    if timezone is None:
+        timezone = get_current_timezone()
+    # Emulate the behavior of astimezone() on Python < 3.6.
+    if is_naive(value):
+        raise ValueError("localtime() cannot be applied to a naive datetime")
+    return value.astimezone(timezone)
+
+
+def localdate(value=None, timezone=None):
+    """
+    Convert an aware datetime to local time and return the value's date.
+
+    Only aware datetimes are allowed. When value is omitted, it defaults to
+    now().
+
+    Local time is defined by the current time zone, unless another time zone is
+    specified.
+    """
+    return localtime(value, timezone).date()
+
+
+def now():
+    """
+    Return an aware or naive datetime.datetime, depending on settings.USE_TZ.
+    """
+    if settings.USE_TZ:
+        # timeit shows that datetime.now(tz=utc) is 24% slower
+        return datetime.utcnow().replace(tzinfo=utc)
+    else:
+        return datetime.now()
+
+
+# By design, these four functions don't perform any checks on their arguments.
+# The caller should ensure that they don't receive an invalid value like None.
+
+def is_aware(value):
+    """
+    Determine if a given datetime.datetime is aware.
+
+    The concept is defined in Python's docs:
+    http://docs.python.org/library/datetime.html#datetime.tzinfo
+
+    Assuming value.tzinfo is either None or a proper datetime.tzinfo,
+    value.utcoffset() implements the appropriate logic.
+    """
+    return value.utcoffset() is not None
+
+
+def is_naive(value):
+    """
+    Determine if a given datetime.datetime is naive.
+
+    The concept is defined in Python's docs:
+    http://docs.python.org/library/datetime.html#datetime.tzinfo
+
+    Assuming value.tzinfo is either None or a proper datetime.tzinfo,
+    value.utcoffset() implements the appropriate logic.
+    """
+    return value.utcoffset() is None
+
+
+def make_aware(value, timezone=None, is_dst=None):
+    """Make a naive datetime.datetime in a given time zone aware."""
+    if timezone is None:
+        timezone = get_current_timezone()
+    if hasattr(timezone, 'localize'):
+        # This method is available for pytz time zones.
+        return timezone.localize(value, is_dst=is_dst)
+    else:
+        # Check that we won't overwrite the timezone of an aware datetime.
+        if is_aware(value):
+            raise ValueError(
+                "make_aware expects a naive datetime, got %s" % value)
+        # This may be wrong around DST changes!
+        return value.replace(tzinfo=timezone)
+
+
+def make_naive(value, timezone=None):
+    """Make an aware datetime.datetime naive in a given time zone."""
+    if timezone is None:
+        timezone = get_current_timezone()
+    # Emulate the behavior of astimezone() on Python < 3.6.
+    if is_naive(value):
+        raise ValueError("make_naive() cannot be applied to a naive datetime")
+    return value.astimezone(timezone).replace(tzinfo=None)

flex/lib/python3.6/site-packages/django/utils/translation/__init__.py

@@ -0,0 +1,260 @@
+"""
+Internationalization support.
+"""
+import re
+import warnings
+from contextlib import ContextDecorator
+
+from django.utils.deprecation import RemovedInDjango21Warning
+from django.utils.functional import lazy
+
+__all__ = [
+    'activate', 'deactivate', 'override', 'deactivate_all',
+    'get_language', 'get_language_from_request',
+    'get_language_info', 'get_language_bidi',
+    'check_for_language', 'to_locale', 'templatize', 'string_concat',
+    'gettext', 'gettext_lazy', 'gettext_noop',
+    'ugettext', 'ugettext_lazy', 'ugettext_noop',
+    'ngettext', 'ngettext_lazy',
+    'ungettext', 'ungettext_lazy',
+    'pgettext', 'pgettext_lazy',
+    'npgettext', 'npgettext_lazy',
+    'LANGUAGE_SESSION_KEY',
+]
+
+LANGUAGE_SESSION_KEY = '_language'
+
+
+class TranslatorCommentWarning(SyntaxWarning):
+    pass
+
+
+# Here be dragons, so a short explanation of the logic won't hurt:
+# We are trying to solve two problems: (1) access settings, in particular
+# settings.USE_I18N, as late as possible, so that modules can be imported
+# without having to first configure Django, and (2) if some other code creates
+# a reference to one of these functions, don't break that reference when we
+# replace the functions with their real counterparts (once we do access the
+# settings).
+
+class Trans:
+    """
+    The purpose of this class is to store the actual translation function upon
+    receiving the first call to that function. After this is done, changes to
+    USE_I18N will have no effect to which function is served upon request. If
+    your tests rely on changing USE_I18N, you can delete all the functions
+    from _trans.__dict__.
+
+    Note that storing the function with setattr will have a noticeable
+    performance effect, as access to the function goes the normal path,
+    instead of using __getattr__.
+    """
+
+    def __getattr__(self, real_name):
+        from django.conf import settings
+        if settings.USE_I18N:
+            from django.utils.translation import trans_real as trans
+        else:
+            from django.utils.translation import trans_null as trans
+        setattr(self, real_name, getattr(trans, real_name))
+        return getattr(trans, real_name)
+
+
+_trans = Trans()
+
+# The Trans class is no more needed, so remove it from the namespace.
+del Trans
+
+
+def gettext_noop(message):
+    return _trans.gettext_noop(message)
+
+
+ugettext_noop = gettext_noop
+
+
+def gettext(message):
+    return _trans.gettext(message)
+
+
+# An alias since Django 2.0
+ugettext = gettext
+
+
+def ngettext(singular, plural, number):
+    return _trans.ngettext(singular, plural, number)
+
+
+# An alias since Django 2.0
+ungettext = ngettext
+
+
+def pgettext(context, message):
+    return _trans.pgettext(context, message)
+
+
+def npgettext(context, singular, plural, number):
+    return _trans.npgettext(context, singular, plural, number)
+
+
+gettext_lazy = ugettext_lazy = lazy(gettext, str)
+pgettext_lazy = lazy(pgettext, str)
+
+
+def lazy_number(func, resultclass, number=None, **kwargs):
+    if isinstance(number, int):
+        kwargs['number'] = number
+        proxy = lazy(func, resultclass)(**kwargs)
+    else:
+        original_kwargs = kwargs.copy()
+
+        class NumberAwareString(resultclass):
+            def __bool__(self):
+                return bool(kwargs['singular'])
+
+            def __mod__(self, rhs):
+                if isinstance(rhs, dict) and number:
+                    try:
+                        number_value = rhs[number]
+                    except KeyError:
+                        raise KeyError(
+                            "Your dictionary lacks key '%s\'. Please provide "
+                            "it, because it is required to determine whether "
+                            "string is singular or plural." % number
+                        )
+                else:
+                    number_value = rhs
+                kwargs['number'] = number_value
+                translated = func(**kwargs)
+                try:
+                    translated = translated % rhs
+                except TypeError:
+                    # String doesn't contain a placeholder for the number.
+                    pass
+                return translated
+
+        proxy = lazy(lambda **kwargs: NumberAwareString(), NumberAwareString)(**kwargs)
+        proxy.__reduce__ = lambda: (_lazy_number_unpickle, (func, resultclass, number, original_kwargs))
+    return proxy
+
+
+def _lazy_number_unpickle(func, resultclass, number, kwargs):
+    return lazy_number(func, resultclass, number=number, **kwargs)
+
+
+def ngettext_lazy(singular, plural, number=None):
+    return lazy_number(ngettext, str, singular=singular, plural=plural, number=number)
+
+
+# An alias since Django 2.0
+ungettext_lazy = ngettext_lazy
+
+
+def npgettext_lazy(context, singular, plural, number=None):
+    return lazy_number(npgettext, str, context=context, singular=singular, plural=plural, number=number)
+
+
+def activate(language):
+    return _trans.activate(language)
+
+
+def deactivate():
+    return _trans.deactivate()
+
+
+class override(ContextDecorator):
+    def __init__(self, language, deactivate=False):
+        self.language = language
+        self.deactivate = deactivate
+
+    def __enter__(self):
+        self.old_language = get_language()
+        if self.language is not None:
+            activate(self.language)
+        else:
+            deactivate_all()
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        if self.old_language is None:
+            deactivate_all()
+        elif self.deactivate:
+            deactivate()
+        else:
+            activate(self.old_language)
+
+
+def get_language():
+    return _trans.get_language()
+
+
+def get_language_bidi():
+    return _trans.get_language_bidi()
+
+
+def check_for_language(lang_code):
+    return _trans.check_for_language(lang_code)
+
+
+def to_locale(language):
+    return _trans.to_locale(language)
+
+
+def get_language_from_request(request, check_path=False):
+    return _trans.get_language_from_request(request, check_path)
+
+
+def get_language_from_path(path):
+    return _trans.get_language_from_path(path)
+
+
+def templatize(src, **kwargs):
+    from .template import templatize
+    return templatize(src, **kwargs)
+
+
+def deactivate_all():
+    return _trans.deactivate_all()
+
+
+def _string_concat(*strings):
+    """
+    Lazy variant of string concatenation, needed for translations that are
+    constructed from multiple parts.
+    """
+    warnings.warn(
+        'django.utils.translate.string_concat() is deprecated in '
+        'favor of django.utils.text.format_lazy().',
+        RemovedInDjango21Warning, stacklevel=2)
+    return ''.join(str(s) for s in strings)
+
+
+string_concat = lazy(_string_concat, str)
+
+
+def get_language_info(lang_code):
+    from django.conf.locale import LANG_INFO
+    try:
+        lang_info = LANG_INFO[lang_code]
+        if 'fallback' in lang_info and 'name' not in lang_info:
+            info = get_language_info(lang_info['fallback'][0])
+        else:
+            info = lang_info
+    except KeyError:
+        if '-' not in lang_code:
+            raise KeyError("Unknown language code %s." % lang_code)
+        generic_lang_code = lang_code.split('-')[0]
+        try:
+            info = LANG_INFO[generic_lang_code]
+        except KeyError:
+            raise KeyError("Unknown language code %s and %s." % (lang_code, generic_lang_code))
+
+    if info:
+        info['name_translated'] = gettext_lazy(info['name'])
+    return info
+
+
+trim_whitespace_re = re.compile(r'\s*\n\s*')
+
+
+def trim_whitespace(s):
+    return trim_whitespace_re.sub(' ', s.strip())

flex/lib/python3.6/site-packages/django/utils/translation/template.py

@@ -0,0 +1,230 @@
+import re
+import warnings
+from io import StringIO
+
+from django.template.base import (
+    TOKEN_BLOCK, TOKEN_COMMENT, TOKEN_TEXT, TOKEN_VAR, TRANSLATOR_COMMENT_MARK,
+    Lexer,
+)
+
+from . import TranslatorCommentWarning, trim_whitespace
+
+dot_re = re.compile(r'\S')
+
+
+def blankout(src, char):
+    """
+    Change every non-whitespace character to the given char.
+    Used in the templatize function.
+    """
+    return dot_re.sub(char, src)
+
+
+context_re = re.compile(r"""^\s+.*context\s+((?:"[^"]*?")|(?:'[^']*?'))\s*""")
+inline_re = re.compile(
+    # Match the trans 'some text' part
+    r"""^\s*trans\s+((?:"[^"]*?")|(?:'[^']*?'))"""
+    # Match and ignore optional filters
+    r"""(?:\s*\|\s*[^\s:]+(?::(?:[^\s'":]+|(?:"[^"]*?")|(?:'[^']*?')))?)*"""
+    # Match the optional context part
+    r"""(\s+.*context\s+((?:"[^"]*?")|(?:'[^']*?')))?\s*"""
+)
+block_re = re.compile(r"""^\s*blocktrans(\s+.*context\s+((?:"[^"]*?")|(?:'[^']*?')))?(?:\s+|$)""")
+endblock_re = re.compile(r"""^\s*endblocktrans$""")
+plural_re = re.compile(r"""^\s*plural$""")
+constant_re = re.compile(r"""_\(((?:".*?")|(?:'.*?'))\)""")
+
+
+def templatize(src, origin=None):
+    """
+    Turn a Django template into something that is understood by xgettext. It
+    does so by translating the Django translation tags into standard gettext
+    function invocations.
+    """
+    out = StringIO('')
+    message_context = None
+    intrans = False
+    inplural = False
+    trimmed = False
+    singular = []
+    plural = []
+    incomment = False
+    comment = []
+    lineno_comment_map = {}
+    comment_lineno_cache = None
+    # Adding the u prefix allows gettext to recognize the string (#26093).
+    raw_prefix = 'u'
+
+    def join_tokens(tokens, trim=False):
+        message = ''.join(tokens)
+        if trim:
+            message = trim_whitespace(message)
+        return message
+
+    for t in Lexer(src).tokenize():
+        if incomment:
+            if t.token_type == TOKEN_BLOCK and t.contents == 'endcomment':
+                content = ''.join(comment)
+                translators_comment_start = None
+                for lineno, line in enumerate(content.splitlines(True)):
+                    if line.lstrip().startswith(TRANSLATOR_COMMENT_MARK):
+                        translators_comment_start = lineno
+                for lineno, line in enumerate(content.splitlines(True)):
+                    if translators_comment_start is not None and lineno >= translators_comment_start:
+                        out.write(' # %s' % line)
+                    else:
+                        out.write(' #\n')
+                incomment = False
+                comment = []
+            else:
+                comment.append(t.contents)
+        elif intrans:
+            if t.token_type == TOKEN_BLOCK:
+                endbmatch = endblock_re.match(t.contents)
+                pluralmatch = plural_re.match(t.contents)
+                if endbmatch:
+                    if inplural:
+                        if message_context:
+                            out.write(' npgettext({p}{!r}, {p}{!r}, {p}{!r},count) '.format(
+                                message_context,
+                                join_tokens(singular, trimmed),
+                                join_tokens(plural, trimmed),
+                                p=raw_prefix,
+                            ))
+                        else:
+                            out.write(' ngettext({p}{!r}, {p}{!r}, count) '.format(
+                                join_tokens(singular, trimmed),
+                                join_tokens(plural, trimmed),
+                                p=raw_prefix,
+                            ))
+                        for part in singular:
+                            out.write(blankout(part, 'S'))
+                        for part in plural:
+                            out.write(blankout(part, 'P'))
+                    else:
+                        if message_context:
+                            out.write(' pgettext({p}{!r}, {p}{!r}) '.format(
+                                message_context,
+                                join_tokens(singular, trimmed),
+                                p=raw_prefix,
+                            ))
+                        else:
+                            out.write(' gettext({p}{!r}) '.format(
+                                join_tokens(singular, trimmed),
+                                p=raw_prefix,
+                            ))
+                        for part in singular:
+                            out.write(blankout(part, 'S'))
+                    message_context = None
+                    intrans = False
+                    inplural = False
+                    singular = []
+                    plural = []
+                elif pluralmatch:
+                    inplural = True
+                else:
+                    filemsg = ''
+                    if origin:
+                        filemsg = 'file %s, ' % origin
+                    raise SyntaxError(
+                        "Translation blocks must not include other block tags: "
+                        "%s (%sline %d)" % (t.contents, filemsg, t.lineno)
+                    )
+            elif t.token_type == TOKEN_VAR:
+                if inplural:
+                    plural.append('%%(%s)s' % t.contents)
+                else:
+                    singular.append('%%(%s)s' % t.contents)
+            elif t.token_type == TOKEN_TEXT:
+                contents = t.contents.replace('%', '%%')
+                if inplural:
+                    plural.append(contents)
+                else:
+                    singular.append(contents)
+        else:
+            # Handle comment tokens (`{# ... #}`) plus other constructs on
+            # the same line:
+            if comment_lineno_cache is not None:
+                cur_lineno = t.lineno + t.contents.count('\n')
+                if comment_lineno_cache == cur_lineno:
+                    if t.token_type != TOKEN_COMMENT:
+                        for c in lineno_comment_map[comment_lineno_cache]:
+                            filemsg = ''
+                            if origin:
+                                filemsg = 'file %s, ' % origin
+                            warn_msg = (
+                                "The translator-targeted comment '%s' "
+                                "(%sline %d) was ignored, because it wasn't "
+                                "the last item on the line."
+                            ) % (c, filemsg, comment_lineno_cache)
+                            warnings.warn(warn_msg, TranslatorCommentWarning)
+                        lineno_comment_map[comment_lineno_cache] = []
+                else:
+                    out.write('# %s' % ' | '.join(lineno_comment_map[comment_lineno_cache]))
+                comment_lineno_cache = None
+
+            if t.token_type == TOKEN_BLOCK:
+                imatch = inline_re.match(t.contents)
+                bmatch = block_re.match(t.contents)
+                cmatches = constant_re.findall(t.contents)
+                if imatch:
+                    g = imatch.group(1)
+                    if g[0] == '"':
+                        g = g.strip('"')
+                    elif g[0] == "'":
+                        g = g.strip("'")
+                    g = g.replace('%', '%%')
+                    if imatch.group(2):
+                        # A context is provided
+                        context_match = context_re.match(imatch.group(2))
+                        message_context = context_match.group(1)
+                        if message_context[0] == '"':
+                            message_context = message_context.strip('"')
+                        elif message_context[0] == "'":
+                            message_context = message_context.strip("'")
+                        out.write(' pgettext({p}{!r}, {p}{!r}) '.format(
+                            message_context, g, p=raw_prefix
+                        ))
+                        message_context = None
+                    else:
+                        out.write(' gettext({p}{!r}) '.format(g, p=raw_prefix))
+                elif bmatch:
+                    for fmatch in constant_re.findall(t.contents):
+                        out.write(' _(%s) ' % fmatch)
+                    if bmatch.group(1):
+                        # A context is provided
+                        context_match = context_re.match(bmatch.group(1))
+                        message_context = context_match.group(1)
+                        if message_context[0] == '"':
+                            message_context = message_context.strip('"')
+                        elif message_context[0] == "'":
+                            message_context = message_context.strip("'")
+                    intrans = True
+                    inplural = False
+                    trimmed = 'trimmed' in t.split_contents()
+                    singular = []
+                    plural = []
+                elif cmatches:
+                    for cmatch in cmatches:
+                        out.write(' _(%s) ' % cmatch)
+                elif t.contents == 'comment':
+                    incomment = True
+                else:
+                    out.write(blankout(t.contents, 'B'))
+            elif t.token_type == TOKEN_VAR:
+                parts = t.contents.split('|')
+                cmatch = constant_re.match(parts[0])
+                if cmatch:
+                    out.write(' _(%s) ' % cmatch.group(1))
+                for p in parts[1:]:
+                    if p.find(':_(') >= 0:
+                        out.write(' %s ' % p.split(':', 1)[1])
+                    else:
+                        out.write(blankout(p, 'F'))
+            elif t.token_type == TOKEN_COMMENT:
+                if t.contents.lstrip().startswith(TRANSLATOR_COMMENT_MARK):
+                    lineno_comment_map.setdefault(t.lineno, []).append(t.contents)
+                    comment_lineno_cache = t.lineno
+            else:
+                out.write(blankout(t.contents, 'X'))
+    return out.getvalue()

flex/lib/python3.6/site-packages/django/utils/translation/trans_null.py

@@ -0,0 +1,68 @@
+# These are versions of the functions in django.utils.translation.trans_real
+# that don't actually do anything. This is purely for performance, so that
+# settings.USE_I18N = False can use this module rather than trans_real.py.
+
+from django.conf import settings
+
+
+def gettext(message):
+    return message
+
+
+gettext_noop = gettext_lazy = _ = gettext
+
+
+def ngettext(singular, plural, number):
+    if number == 1:
+        return singular
+    return plural
+
+
+ngettext_lazy = ngettext
+
+
+def pgettext(context, message):
+    return gettext(message)
+
+
+def npgettext(context, singular, plural, number):
+    return ngettext(singular, plural, number)
+
+
+def activate(x):
+    return None
+
+
+def deactivate():
+    return None
+
+
+deactivate_all = deactivate
+
+
+def get_language():
+    return settings.LANGUAGE_CODE
+
+
+def get_language_bidi():
+    return settings.LANGUAGE_CODE in settings.LANGUAGES_BIDI
+
+
+def check_for_language(x):
+    return True
+
+
+def to_locale(language):
+    p = language.find('-')
+    if p >= 0:
+        return language[:p].lower() + '_' + language[p + 1:].upper()
+    else:
+        return language.lower()
+
+
+def get_language_from_request(request, check_path=False):
+    return settings.LANGUAGE_CODE
+
+
+def get_language_from_path(request):
+    return None

flex/lib/python3.6/site-packages/django/utils/translation/trans_real.py

@@ -0,0 +1,533 @@
+"""Translation helper functions."""
+import functools
+import gettext as gettext_module
+import os
+import re
+import sys
+import warnings
+from collections import OrderedDict
+from threading import local
+
+from django.apps import apps
+from django.conf import settings
+from django.conf.locale import LANG_INFO
+from django.core.exceptions import AppRegistryNotReady
+from django.core.signals import setting_changed
+from django.dispatch import receiver
+from django.utils.safestring import SafeData, mark_safe
+from django.utils.translation import LANGUAGE_SESSION_KEY
+
+# Translations are cached in a dictionary for every language.
+# The active translations are stored by threadid to make them thread local.
+_translations = {}
+_active = local()
+
+# The default translation is based on the settings file.
+_default = None
+
+# magic gettext number to separate context from message
+CONTEXT_SEPARATOR = "\x04"
+
+# Format of Accept-Language header values. From RFC 2616, section 14.4 and 3.9
+# and RFC 3066, section 2.1
+accept_language_re = re.compile(r'''
+        ([A-Za-z]{1,8}(?:-[A-Za-z0-9]{1,8})*|\*)      # "en", "en-au", "x-y-z", "es-419", "*"
+        (?:\s*;\s*q=(0(?:\.\d{,3})?|1(?:\.0{,3})?))?  # Optional "q=1.00", "q=0.8"
+        (?:\s*,\s*|$)                                 # Multiple accepts per header.
+        ''', re.VERBOSE)
+
+language_code_re = re.compile(
+    r'^[a-z]{1,8}(?:-[a-z0-9]{1,8})*(?:@[a-z0-9]{1,20})?$',
+    re.IGNORECASE
+)
+
+language_code_prefix_re = re.compile(r'^/(\w+([@-]\w+)?)(/|$)')
+
+
+@receiver(setting_changed)
+def reset_cache(**kwargs):
+    """
+    Reset global state when LANGUAGES setting has been changed, as some
+    languages should no longer be accepted.
+    """
+    if kwargs['setting'] in ('LANGUAGES', 'LANGUAGE_CODE'):
+        check_for_language.cache_clear()
+        get_languages.cache_clear()
+        get_supported_language_variant.cache_clear()
+
+
+def to_locale(language):
+    """Turn a language name (en-us) into a locale name (en_US)."""
+    language = language.lower()
+    parts = language.split('-')
+    try:
+        country = parts[1]
+    except IndexError:
+        return language
+    else:
+        # A language with > 2 characters after the dash only has its first
+        # character after the dash capitalized; e.g. sr-latn becomes sr_Latn.
+        # A language with 2 characters after the dash has both characters
+        # capitalized; e.g. en-us becomes en_US.
+        parts[1] = country.title() if len(country) > 2 else country.upper()
+    return parts[0] + '_' + '-'.join(parts[1:])
+
+
+def to_language(locale):
+    """Turn a locale name (en_US) into a language name (en-us)."""
+    p = locale.find('_')
+    if p >= 0:
+        return locale[:p].lower() + '-' + locale[p + 1:].lower()
+    else:
+        return locale.lower()
+
+
+class DjangoTranslation(gettext_module.GNUTranslations):
+    """
+    Set up the GNUTranslations context with regard to output charset.
+
+    This translation object will be constructed out of multiple GNUTranslations
+    objects by merging their catalogs. It will construct an object for the
+    requested language and add a fallback to the default language, if it's
+    different from the requested language.
+    """
+    domain = 'django'
+
+    def __init__(self, language, domain=None, localedirs=None):
+        """Create a GNUTranslations() using many locale directories"""
+        gettext_module.GNUTranslations.__init__(self)
+        if domain is not None:
+            self.domain = domain
+
+        self.__language = language
+        self.__to_language = to_language(language)
+        self.__locale = to_locale(language)
+        self._catalog = None
+        # If a language doesn't have a catalog, use the Germanic default for
+        # pluralization: anything except one is pluralized.
+        self.plural = lambda n: int(n != 1)
+
+        if self.domain == 'django':
+            if localedirs is not None:
+                # A module-level cache is used for caching 'django' translations
+                warnings.warn("localedirs is ignored when domain is 'django'.", RuntimeWarning)
+                localedirs = None
+            self._init_translation_catalog()
+
+        if localedirs:
+            for localedir in localedirs:
+                translation = self._new_gnu_trans(localedir)
+                self.merge(translation)
+        else:
+            self._add_installed_apps_translations()
+
+        self._add_local_translations()
+        if self.__language == settings.LANGUAGE_CODE and self.domain == 'django' and self._catalog is None:
+            # default lang should have at least one translation file available.
+            raise IOError("No translation files found for default language %s." % settings.LANGUAGE_CODE)
+        self._add_fallback(localedirs)
+        if self._catalog is None:
+            # No catalogs found for this language, set an empty catalog.
+            self._catalog = {}
+
+    def __repr__(self):
+        return "<DjangoTranslation lang:%s>" % self.__language
+
+    def _new_gnu_trans(self, localedir, use_null_fallback=True):
+        """
+        Return a mergeable gettext.GNUTranslations instance.
+
+        A convenience wrapper. By default gettext uses 'fallback=False'.
+        Using param `use_null_fallback` to avoid confusion with any other
+        references to 'fallback'.
+        """
+        return gettext_module.translation(
+            domain=self.domain,
+            localedir=localedir,
+            languages=[self.__locale],
+            codeset='utf-8',
+            fallback=use_null_fallback)
+
+    def _init_translation_catalog(self):
+        """Create a base catalog using global django translations."""
+        settingsfile = sys.modules[settings.__module__].__file__
+        localedir = os.path.join(os.path.dirname(settingsfile), 'locale')
+        translation = self._new_gnu_trans(localedir)
+        self.merge(translation)
+
+    def _add_installed_apps_translations(self):
+        """Merge translations from each installed app."""
+        try:
+            app_configs = reversed(list(apps.get_app_configs()))
+        except AppRegistryNotReady:
+            raise AppRegistryNotReady(
+                "The translation infrastructure cannot be initialized before the "
+                "apps registry is ready. Check that you don't make non-lazy "
+                "gettext calls at import time.")
+        for app_config in app_configs:
+            localedir = os.path.join(app_config.path, 'locale')
+            if os.path.exists(localedir):
+                translation = self._new_gnu_trans(localedir)
+                self.merge(translation)
+
+    def _add_local_translations(self):
+        """Merge translations defined in LOCALE_PATHS."""
+        for localedir in reversed(settings.LOCALE_PATHS):
+            translation = self._new_gnu_trans(localedir)
+            self.merge(translation)
+
+    def _add_fallback(self, localedirs=None):
+        """Set the GNUTranslations() fallback with the default language."""
+        # Don't set a fallback for the default language or any English variant
+        # (as it's empty, so it'll ALWAYS fall back to the default language)
+        if self.__language == settings.LANGUAGE_CODE or self.__language.startswith('en'):
+            return
+        if self.domain == 'django':
+            # Get from cache
+            default_translation = translation(settings.LANGUAGE_CODE)
+        else:
+            default_translation = DjangoTranslation(
+                settings.LANGUAGE_CODE, domain=self.domain, localedirs=localedirs
+            )
+        self.add_fallback(default_translation)
+
+    def merge(self, other):
+        """Merge another translation into this catalog."""
+        if not getattr(other, '_catalog', None):
+            return  # NullTranslations() has no _catalog
+        if self._catalog is None:
+            # Take plural and _info from first catalog found (generally Django's).
+            self.plural = other.plural
+            self._info = other._info.copy()
+            self._catalog = other._catalog.copy()
+        else:
+            self._catalog.update(other._catalog)
+
+    def language(self):
+        """Return the translation language."""
+        return self.__language
+
+    def to_language(self):
+        """Return the translation language name."""
+        return self.__to_language
+
+
+def translation(language):
+    """
+    Return a translation object in the default 'django' domain.
+    """
+    global _translations
+    if language not in _translations:
+        _translations[language] = DjangoTranslation(language)
+    return _translations[language]
+
+
+def activate(language):
+    """
+    Fetch the translation object for a given language and install it as the
+    current translation object for the current thread.
+    """
+    if not language:
+        return
+    _active.value = translation(language)
+
+
+def deactivate():
+    """
+    Uninstall the active translation object so that further _() calls resolve
+    to the default translation object.
+    """
+    if hasattr(_active, "value"):
+        del _active.value
+
+
+def deactivate_all():
+    """
+    Make the active translation object a NullTranslations() instance. This is
+    useful when we want delayed translations to appear as the original string
+    for some reason.
+    """
+    _active.value = gettext_module.NullTranslations()
+    _active.value.to_language = lambda *args: None
+
+
+def get_language():
+    """Return the currently selected language."""
+    t = getattr(_active, "value", None)
+    if t is not None:
+        try:
+            return t.to_language()
+        except AttributeError:
+            pass
+    # If we don't have a real translation object, assume it's the default language.
+    return settings.LANGUAGE_CODE
+
+
+def get_language_bidi():
+    """
+    Return selected language's BiDi layout.
+
+    * False = left-to-right layout
+    * True = right-to-left layout
+    """
+    lang = get_language()
+    if lang is None:
+        return False
+    else:
+        base_lang = get_language().split('-')[0]
+        return base_lang in settings.LANGUAGES_BIDI
+
+
+def catalog():
+    """
+    Return the current active catalog for further processing.
+    This can be used if you need to modify the catalog or want to access the
+    whole message catalog instead of just translating one string.
+    """
+    global _default
+
+    t = getattr(_active, "value", None)
+    if t is not None:
+        return t
+    if _default is None:
+        _default = translation(settings.LANGUAGE_CODE)
+    return _default
+
+
+def gettext(message):
+    """
+    Translate the 'message' string. It uses the current thread to find the
+    translation object to use. If no current translation is activated, the
+    message will be run through the default translation object.
+    """
+    global _default
+
+    eol_message = message.replace('\r\n', '\n').replace('\r', '\n')
+
+    if len(eol_message) == 0:
+        # Return an empty value of the corresponding type if an empty message
+        # is given, instead of metadata, which is the default gettext behavior.
+        result = type(message)("")
+    else:
+        _default = _default or translation(settings.LANGUAGE_CODE)
+        translation_object = getattr(_active, "value", _default)
+
+        result = translation_object.gettext(eol_message)
+
+    if isinstance(message, SafeData):
+        return mark_safe(result)
+
+    return result
+
+
+def pgettext(context, message):
+    msg_with_ctxt = "%s%s%s" % (context, CONTEXT_SEPARATOR, message)
+    result = gettext(msg_with_ctxt)
+    if CONTEXT_SEPARATOR in result:
+        # Translation not found
+        result = message
+    elif isinstance(message, SafeData):
+        result = mark_safe(result)
+    return result
+
+
+def gettext_noop(message):
+    """
+    Mark strings for translation but don't translate them now. This can be
+    used to store strings in global variables that should stay in the base
+    language (because they might be used externally) and will be translated
+    later.
+    """
+    return message
+
+
+def do_ntranslate(singular, plural, number, translation_function):
+    global _default
+
+    t = getattr(_active, "value", None)
+    if t is not None:
+        return getattr(t, translation_function)(singular, plural, number)
+    if _default is None:
+        _default = translation(settings.LANGUAGE_CODE)
+    return getattr(_default, translation_function)(singular, plural, number)
+
+
+def ngettext(singular, plural, number):
+    """
+    Return a string of the translation of either the singular or plural,
+    based on the number.
+    """
+    return do_ntranslate(singular, plural, number, 'ngettext')
+
+
+def npgettext(context, singular, plural, number):
+    msgs_with_ctxt = ("%s%s%s" % (context, CONTEXT_SEPARATOR, singular),
+                      "%s%s%s" % (context, CONTEXT_SEPARATOR, plural),
+                      number)
+    result = ngettext(*msgs_with_ctxt)
+    if CONTEXT_SEPARATOR in result:
+        # Translation not found
+        result = ngettext(singular, plural, number)
+    return result
+
+
+def all_locale_paths():
+    """
+    Return a list of paths to user-provides languages files.
+    """
+    globalpath = os.path.join(
+        os.path.dirname(sys.modules[settings.__module__].__file__), 'locale')
+    return [globalpath] + list(settings.LOCALE_PATHS)
+
+
+@functools.lru_cache(maxsize=1000)
+def check_for_language(lang_code):
+    """
+    Check whether there is a global language file for the given language
+    code. This is used to decide whether a user-provided language is
+    available.
+
+    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
+    as the provided language codes are taken from the HTTP request. See also
+    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
+    """
+    # First, a quick check to make sure lang_code is well-formed (#21458)
+    if lang_code is None or not language_code_re.search(lang_code):
+        return False
+    for path in all_locale_paths():
+        if gettext_module.find('django', path, [to_locale(lang_code)]) is not None:
+            return True
+    return False
+
+
+@functools.lru_cache()
+def get_languages():
+    """
+    Cache of settings.LANGUAGES in an OrderedDict for easy lookups by key.
+    """
+    return OrderedDict(settings.LANGUAGES)
+
+
+@functools.lru_cache(maxsize=1000)
+def get_supported_language_variant(lang_code, strict=False):
+    """
+    Return the language-code that's listed in supported languages, possibly
+    selecting a more generic variant. Raise LookupError if nothing is found.
+
+    If `strict` is False (the default), look for an alternative
+    country-specific variant when the currently checked is not found.
+
+    lru_cache should have a maxsize to prevent from memory exhaustion attacks,
+    as the provided language codes are taken from the HTTP request. See also
+    <https://www.djangoproject.com/weblog/2007/oct/26/security-fix/>.
+    """
+    if lang_code:
+        # If 'fr-ca' is not supported, try special fallback or language-only 'fr'.
+        possible_lang_codes = [lang_code]
+        try:
+            possible_lang_codes.extend(LANG_INFO[lang_code]['fallback'])
+        except KeyError:
+            pass
+        generic_lang_code = lang_code.split('-')[0]
+        possible_lang_codes.append(generic_lang_code)
+        supported_lang_codes = get_languages()
+
+        for code in possible_lang_codes:
+            if code in supported_lang_codes and check_for_language(code):
+                return code
+        if not strict:
+            # if fr-fr is not supported, try fr-ca.
+            for supported_code in supported_lang_codes:
+                if supported_code.startswith(generic_lang_code + '-'):
+                    return supported_code
+    raise LookupError(lang_code)
+
+
+def get_language_from_path(path, strict=False):
+    """
+    Return the language-code if there is a valid language-code
+    found in the `path`.
+
+    If `strict` is False (the default), the function will look for an alternative
+    country-specific variant when the currently checked is not found.
+    """
+    regex_match = language_code_prefix_re.match(path)
+    if not regex_match:
+        return None
+    lang_code = regex_match.group(1)
+    try:
+        return get_supported_language_variant(lang_code, strict=strict)
+    except LookupError:
+        return None
+
+
+def get_language_from_request(request, check_path=False):
+    """
+    Analyze the request to find what language the user wants the system to
+    show. Only languages listed in settings.LANGUAGES are taken into account.
+    If the user requests a sublanguage where we have a main language, we send
+    out the main language.
+
+    If check_path is True, the URL path prefix will be checked for a language
+    code, otherwise this is skipped for backwards compatibility.
+    """
+    if check_path:
+        lang_code = get_language_from_path(request.path_info)
+        if lang_code is not None:
+            return lang_code
+
+    supported_lang_codes = get_languages()
+
+    if hasattr(request, 'session'):
+        lang_code = request.session.get(LANGUAGE_SESSION_KEY)
+        if lang_code in supported_lang_codes and lang_code is not None and check_for_language(lang_code):
+            return lang_code
+
+    lang_code = request.COOKIES.get(settings.LANGUAGE_COOKIE_NAME)
+
+    try:
+        return get_supported_language_variant(lang_code)
+    except LookupError:
+        pass
+
+    accept = request.META.get('HTTP_ACCEPT_LANGUAGE', '')
+    for accept_lang, unused in parse_accept_lang_header(accept):
+        if accept_lang == '*':
+            break
+
+        if not language_code_re.search(accept_lang):
+            continue
+
+        try:
+            return get_supported_language_variant(accept_lang)
+        except LookupError:
+            continue
+
+    try:
+        return get_supported_language_variant(settings.LANGUAGE_CODE)
+    except LookupError:
+        return settings.LANGUAGE_CODE
+
+
+def parse_accept_lang_header(lang_string):
+    """
+    Parse the lang_string, which is the body of an HTTP Accept-Language
+    header, and return a list of (lang, q-value), ordered by 'q' values.
+
+    Return an empty list if there are any format errors in lang_string.
+    """
+    result = []
+    pieces = accept_language_re.split(lang_string.lower())
+    if pieces[-1]:
+        return []
+    for i in range(0, len(pieces) - 1, 3):
+        first, lang, priority = pieces[i:i + 3]
+        if first:
+            return []
+        if priority:
+            priority = float(priority)
+        else:
+            priority = 1.0
+        result.append((lang, priority))
+    result.sort(key=lambda k: k[1], reverse=True)
+    return result

flex/lib/python3.6/site-packages/django/utils/tree.py

@@ -0,0 +1,122 @@
+"""
+A class for storing a tree graph. Primarily used for filter constructs in the
+ORM.
+"""
+
+import copy
+
+
+class Node:
+    """
+    A single internal node in the tree graph. A Node should be viewed as a
+    connection (the root) with the children being either leaf nodes or other
+    Node instances.
+    """
+    # Standard connector type. Clients usually won't use this at all and
+    # subclasses will usually override the value.
+    default = 'DEFAULT'
+
+    def __init__(self, children=None, connector=None, negated=False):
+        """Construct a new Node. If no connector is given, use the default."""
+        self.children = children[:] if children else []
+        self.connector = connector or self.default
+        self.negated = negated
+
+    # Required because django.db.models.query_utils.Q. Q. __init__() is
+    # problematic, but it is a natural Node subclass in all other respects.
+    @classmethod
+    def _new_instance(cls, children=None, connector=None, negated=False):
+        """
+        Create a new instance of this class when new Nodes (or subclasses) are
+        needed in the internal code in this class. Normally, it just shadows
+        __init__(). However, subclasses with an __init__ signature that aren't
+        an extension of Node.__init__ might need to implement this method to
+        allow a Node to create a new instance of them (if they have any extra
+        setting up to do).
+        """
+        obj = Node(children, connector, negated)
+        obj.__class__ = cls
+        return obj
+
+    def __str__(self):
+        template = '(NOT (%s: %s))' if self.negated else '(%s: %s)'
+        return template % (self.connector, ', '.join(str(c) for c in self.children))
+
+    def __repr__(self):
+        return "<%s: %s>" % (self.__class__.__name__, self)
+
+    def __deepcopy__(self, memodict):
+        obj = Node(connector=self.connector, negated=self.negated)
+        obj.__class__ = self.__class__
+        obj.children = copy.deepcopy(self.children, memodict)
+        return obj
+
+    def __len__(self):
+        """Return the the number of children this node has."""
+        return len(self.children)
+
+    def __bool__(self):
+        """Return whether or not this node has children."""
+        return bool(self.children)
+
+    def __contains__(self, other):
+        """Return True if 'other' is a direct child of this instance."""
+        return other in self.children
+
+    def __eq__(self, other):
+        if self.__class__ != other.__class__:
+            return False
+        if (self.connector, self.negated) == (other.connector, other.negated):
+            return self.children == other.children
+        return False
+
+    def __hash__(self):
+        return hash((self.__class__, self.connector, self.negated) + tuple(self.children))
+
+    def add(self, data, conn_type, squash=True):
+        """
+        Combine this tree and the data represented by data using the
+        connector conn_type. The combine is done by squashing the node other
+        away if possible.
+
+        This tree (self) will never be pushed to a child node of the
+        combined tree, nor will the connector or negated properties change.
+
+        Return a node which can be used in place of data regardless if the
+        node other got squashed or not.
+
+        If `squash` is False the data is prepared and added as a child to
+        this tree without further logic.
+        """
+        if data in self.children:
+            return data
+        if not squash:
+            self.children.append(data)
+            return data
+        if self.connector == conn_type:
+            # We can reuse self.children to append or squash the node other.
+            if (isinstance(data, Node) and not data.negated and
+                    (data.connector == conn_type or len(data) == 1)):
+                # We can squash the other node's children directly into this
+                # node. We are just doing (AB)(CD) == (ABCD) here, with the
+                # addition that if the length of the other node is 1 the
+                # connector doesn't matter. However, for the len(self) == 1
+                # case we don't want to do the squashing, as it would alter
+                # self.connector.
+                self.children.extend(data.children)
+                return self
+            else:
+                # We could use perhaps additional logic here to see if some
+                # children could be used for pushdown here.
+                self.children.append(data)
+                return data
+        else:
+            obj = self._new_instance(self.children, self.connector,
+                                     self.negated)
+            self.connector = conn_type
+            self.children = [obj, data]
+            return data
+
+    def negate(self):
+        """Negate the sense of the root connector."""
+        self.negated = not self.negated

flex/lib/python3.6/site-packages/django/utils/version.py

@@ -0,0 +1,94 @@
+import datetime
+import functools
+import os
+import subprocess
+from distutils.version import LooseVersion
+
+
+def get_version(version=None):
+    """Return a PEP 440-compliant version number from VERSION."""
+    version = get_complete_version(version)
+
+    # Now build the two parts of the version number:
+    # main = X.Y[.Z]
+    # sub = .devN - for pre-alpha releases
+    #     | {a|b|rc}N - for alpha, beta, and rc releases
+
+    main = get_main_version(version)
+
+    sub = ''
+    if version[3] == 'alpha' and version[4] == 0:
+        git_changeset = get_git_changeset()
+        if git_changeset:
+            sub = '.dev%s' % git_changeset
+
+    elif version[3] != 'final':
+        mapping = {'alpha': 'a', 'beta': 'b', 'rc': 'rc'}
+        sub = mapping[version[3]] + str(version[4])
+
+    return main + sub
+
+
+def get_main_version(version=None):
+    """Return main version (X.Y[.Z]) from VERSION."""
+    version = get_complete_version(version)
+    parts = 2 if version[2] == 0 else 3
+    return '.'.join(str(x) for x in version[:parts])
+
+
+def get_complete_version(version=None):
+    """
+    Return a tuple of the django version. If version argument is non-empty,
+    check for correctness of the tuple provided.
+    """
+    if version is None:
+        from django import VERSION as version
+    else:
+        assert len(version) == 5
+        assert version[3] in ('alpha', 'beta', 'rc', 'final')
+
+    return version
+
+
+def get_docs_version(version=None):
+    version = get_complete_version(version)
+    if version[3] != 'final':
+        return 'dev'
+    else:
+        return '%d.%d' % version[:2]
+
+
+@functools.lru_cache()
+def get_git_changeset():
+    """Return a numeric identifier of the latest git changeset.
+
+    The result is the UTC timestamp of the changeset in YYYYMMDDHHMMSS format.
+    This value isn't guaranteed to be unique, but collisions are very unlikely,
+    so it's sufficient for generating the development version numbers.
+    """
+    repo_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+    git_log = subprocess.Popen(
+        'git log --pretty=format:%ct --quiet -1 HEAD',
+        stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+        shell=True, cwd=repo_dir, universal_newlines=True,
+    )
+    timestamp = git_log.communicate()[0]
+    try:
+        timestamp = datetime.datetime.utcfromtimestamp(int(timestamp))
+    except ValueError:
+        return None
+    return timestamp.strftime('%Y%m%d%H%M%S')
+
+
+def get_version_tuple(version):
+    """
+    Return a tuple of version numbers (e.g. (1, 2, 3)) from the version
+    string (e.g. '1.2.3').
+    """
+    loose_version = LooseVersion(version)
+    version_numbers = []
+    for item in loose_version.version:
+        if not isinstance(item, int):
+            break
+        version_numbers.append(item)
+    return tuple(version_numbers)

flex/lib/python3.6/site-packages/django/utils/xmlutils.py

@@ -0,0 +1,34 @@
+"""
+Utilities for XML generation/parsing.
+"""
+
+import re
+from collections import OrderedDict
+from xml.sax.saxutils import XMLGenerator
+
+
+class UnserializableContentError(ValueError):
+    pass
+
+
+class SimplerXMLGenerator(XMLGenerator):
+    def addQuickElement(self, name, contents=None, attrs=None):
+        "Convenience method for adding an element with no children"
+        if attrs is None:
+            attrs = {}
+        self.startElement(name, attrs)
+        if contents is not None:
+            self.characters(contents)
+        self.endElement(name)
+
+    def characters(self, content):
+        if content and re.search(r'[\x00-\x08\x0B-\x0C\x0E-\x1F]', content):
+            # Fail loudly when content has control chars (unsupported in XML 1.0)
+            # See http://www.w3.org/International/questions/qa-controls
+            raise UnserializableContentError("Control characters are not supported in XML 1.0")
+        XMLGenerator.characters(self, content)
+
+    def startElement(self, name, attrs):
+        # Sort attrs for a deterministic output.
+        sorted_attrs = OrderedDict(sorted(attrs.items())) if attrs else attrs
+        super().startElement(name, sorted_attrs)