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Authors
=======
* Ionel Cristian Mărieș - https://blog.ionelmc.ro
* Alvin Chow - https://github.com/alvinchow86
* Astrum Kuo - https://github.com/xowenx
* Erik M. Bray - http://iguananaut.net
* Ran Benita - https://github.com/bluetech
* "hugovk" - https://github.com/hugovk
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BSD 2-Clause License
Copyright (c) 2014-2019, Ionel Cristian Mărieș
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
disclaimer.
2. 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.
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 HOLDER 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.
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Metadata-Version: 2.1
Name: lazy-object-proxy
Version: 1.4.1
Summary: A fast and thorough lazy object proxy.
Home-page: https://github.com/ionelmc/python-lazy-object-proxy
Author: Ionel Cristian Mărieș
Author-email: [email protected]
License: BSD 2-Clause License
Project-URL: Documentation, https://python-lazy-object-proxy.readthedocs.io/
Project-URL: Changelog, https://python-lazy-object-proxy.readthedocs.io/en/latest/changelog.html
Project-URL: Issue Tracker, https://github.com/ionelmc/python-lazy-object-proxy/issues
Platform: UNKNOWN
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: License :: OSI Approved :: BSD License
Classifier: Operating System :: Unix
Classifier: Operating System :: POSIX
Classifier: Operating System :: Microsoft :: Windows
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2.7
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.4
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Topic :: Utilities
Requires-Python: >=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*
========
Overview
========
A fast and thorough lazy object proxy.
* Free software: BSD license
Note that this is based on `wrapt`_'s ObjectProxy with one big change: it calls a function the first time the proxy object is
used, while `wrapt.ObjectProxy` just forwards the method calls to the target object.
In other words, you use `lazy-object-proxy` when you only have the object way later and you use `wrapt.ObjectProxy` when you
want to override few methods (by subclassing) and forward everything else to the target object.
Example::
import lazy_object_proxy
def expensive_func():
from time import sleep
print('starting calculation')
# just as example for a very slow computation
sleep(2)
print('finished calculation')
# return the result of the calculation
return 10
obj = lazy_object_proxy.Proxy(expensive_func)
# function is called only when object is actually used
print(obj) # now expensive_func is called
print(obj) # the result without calling the expensive_func
Installation
============
::
pip install lazy-object-proxy
Documentation
=============
https://python-lazy-object-proxy.readthedocs.io/
Development
===========
To run the all tests run::
tox
Acknowledgements
================
This project is based on some code from `wrapt`_ as you can see in the git history.
.. _wrapt: https://github.com/GrahamDumpleton/wrapt
Changelog
=========
1.4.1 (2019-05-10)
------------------
* Fixed wheels being built with ``-coverage`` cflags. No more issues about bogus ``cext.gcda`` files.
* Removed useless C file from wheels.
* Changed ``setup.py`` to use setuptools-scm.
1.4.0 (2019-05-05)
------------------
* Fixed ``__mod__`` for the slots backend. Contributed by Ran Benita in
`#28 <https://github.com/ionelmc/python-lazy-object-proxy/pull/28>`_.
* Dropped support for Python 2.6 and 3.3. Contributed by "hugovk" in
`#24 <https://github.com/ionelmc/python-lazy-object-proxy/pull/24>`_.
1.3.1 (2017-05-05)
------------------
* Fix broken release (``sdist`` had a broken ``MANIFEST.in``).
1.3.0 (2017-05-02)
------------------
* Speed up arithmetic operations involving ``cext.Proxy`` subclasses.
1.2.2 (2016-04-14)
------------------
* Added `manylinux <https://www.python.org/dev/peps/pep-0513/>`_ wheels.
* Minor cleanup in readme.
1.2.1 (2015-08-18)
------------------
* Fix a memory leak (the wrapped object would get bogus references). Contributed by Astrum Kuo in
`#10 <https://github.com/ionelmc/python-lazy-object-proxy/pull/10>`_.
1.2.0 (2015-07-06)
------------------
* Don't instantiate the object when __repr__ is called. This aids with debugging (allows one to see exactly in
what state the proxy is).
1.1.0 (2015-07-05)
------------------
* Added support for pickling. The pickled value is going to be the wrapped object *without* any Proxy container.
* Fixed a memory management issue in the C extension (reference cycles weren't garbage collected due to improper
handling in the C extension). Contributed by Alvin Chow in
`#8 <https://github.com/ionelmc/python-lazy-object-proxy/pull/8>`_.
1.0.2 (2015-04-11)
-----------------------------------------
* First release on PyPI.
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lazy_object_proxy