ydb/contrib/python/contextlib2/py2

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contextlib2 is a backport of the `standard library's contextlib
module `_ to
earlier Python versions.

It also serves as a real world proving ground for possible future
enhancements to the standard library version.

Development
-----------

contextlib2 has no runtime dependencies, but requires ``unittest2`` for testing
on Python 2.x, as well as ``setuptools`` and ``wheel`` to generate universal
wheel archives.

Local testing is just a matter of running ``python test_contextlib2.py``.

You can test against multiple versions of Python with
`tox `_::

pip install tox
tox

Versions currently tested in both tox and Travis CI are:

* CPython 2.7
* CPython 3.4
* CPython 3.5
* CPython 3.6
* CPython 3.7
* PyPy
* PyPy3