undo&redo_implementation

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diff --git a/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/AUTHORS.rst b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/AUTHORS.rst
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--- /dev/null
+++ b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/AUTHORS.rst
@@ -0,0 +1,10 @@
+
+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
diff --git a/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/INSTALLER b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/INSTALLER
new file mode 100644
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--- /dev/null
+++ b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/INSTALLER
@@ -0,0 +1 @@
+pip
diff --git a/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/LICENSE b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/LICENSE
new file mode 100644
index 0000000..de39b84
--- /dev/null
+++ b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/LICENSE
@@ -0,0 +1,21 @@
+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.
diff --git a/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/METADATA b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/METADATA
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+++ b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/METADATA
@@ -0,0 +1,166 @@
+Metadata-Version: 2.1
+Name: lazy-object-proxy
+Version: 1.4.3
+Summary: A fast and thorough lazy object proxy.
+Home-page: https://github.com/ionelmc/python-lazy-object-proxy
+Author: Ionel Cristian Mărieș
+Author-email: contact@ionelmc.ro
+License: BSD-2-Clause
+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 :: 3.8
+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 2-Clause 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
+=========
+
+1.4.3 (2019-10-26)
+------------------
+
+* Added binary wheels for Python 3.8.
+* Fixed license metadata.
+
+1.4.2 (2019-08-22)
+------------------
+
+* Included a ``pyproject.toml`` to allow users install the sdist with old python/setuptools, as the
+  setuptools-scm dep will be fetched by pip instead of setuptools.
+  Fixes `#30 <https://github.com/ionelmc/python-lazy-object-proxy/issues/30>`_.
+
+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.
+
+
diff --git a/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/RECORD b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/RECORD
new file mode 100644
index 0000000..e07e94d
--- /dev/null
+++ b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/RECORD
@@ -0,0 +1,20 @@
+lazy_object_proxy-1.4.3.dist-info/AUTHORS.rst,sha256=8CeCjODba0S8UczLyZBPhpO_J6NMZ9Hz_fE1A1uNe9Y,278
+lazy_object_proxy-1.4.3.dist-info/INSTALLER,sha256=zuuue4knoyJ-UwPPXg8fezS7VCrXJQrAP7zeNuwvFQg,4
+lazy_object_proxy-1.4.3.dist-info/LICENSE,sha256=W-1KNkH2bsSNuN7SNqKV8z2H0CkxXzYXZVhUzw1wxUA,1329
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+lazy_object_proxy-1.4.3.dist-info/top_level.txt,sha256=UNH-FQB-j_8bYqPz3gD90kHvaC42TQqY0thHSnbaa0k,18
+lazy_object_proxy/__init__.py,sha256=pMqxzToF24DuzOltm-Q8nZ3jNDXOaSQcJmiNArdUrlU,410
+lazy_object_proxy/__pycache__/__init__.cpython-37.pyc,,
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+lazy_object_proxy/__pycache__/compat.cpython-37.pyc,,
+lazy_object_proxy/__pycache__/simple.cpython-37.pyc,,
+lazy_object_proxy/__pycache__/slots.cpython-37.pyc,,
+lazy_object_proxy/__pycache__/utils.cpython-37.pyc,,
+lazy_object_proxy/_version.py,sha256=KsdHOInxnNuaG_C69nBloPsRbSiniucSfNG8eBgw8yc,120
+lazy_object_proxy/cext.cp37-win_amd64.pyd,sha256=W0Ps706HlNLprmldUashETxgGaQoq6_A5J4w0PPuoJw,31744
+lazy_object_proxy/compat.py,sha256=DY3HbKwbrbeKY6tkXRNRLJ1go6HJb8HUwWqyw3T5g_g,196
+lazy_object_proxy/simple.py,sha256=guacy8_QbJeBs7vXpPPVoDVkDNXOZ86xyS1dtAeKvOs,8216
+lazy_object_proxy/slots.py,sha256=9DilWUINScpZN26NwmRtscTtaqaEwtCfIoriLq5Nz24,11359
+lazy_object_proxy/utils.py,sha256=x4XTrtlp_mDTWO_EOq_ILIOv2Qol8RLMnRm5M8l3OfU,291
diff --git a/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/WHEEL b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/WHEEL
new file mode 100644
index 0000000..c4dd0f9
--- /dev/null
+++ b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/WHEEL
@@ -0,0 +1,5 @@
+Wheel-Version: 1.0
+Generator: bdist_wheel (0.33.6)
+Root-Is-Purelib: false
+Tag: cp37-cp37m-win_amd64
+
diff --git a/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/top_level.txt b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/top_level.txt
new file mode 100644
index 0000000..bdf032e
--- /dev/null
+++ b/venv/Lib/site-packages/lazy_object_proxy-1.4.3.dist-info/top_level.txt
@@ -0,0 +1 @@
+lazy_object_proxy