Patch from https://github.com/testing-cabal/mock/issues/215

This reverts commit e9db0161.

Issue #288 - mock_open.return_value.<stuff here> was a widely used pattern.

could in Python 3.3.

Patch from Nicola Palumbo and Laurent De Buyst.

Replace set comprehensions with calls to set() and ensure string
formatting has positional format specifiers.

Co-Authored-By: Robert Collins <rbtcollins@hp.com>

This was a regression vs Python 3.4. Patch from Ignacio Rossi

less than 1.3 and the boolean environment marker expression is
reflected into setuptools incorrectly.

six 1.7 is needed for six.wraps.

This way github will process it.

- Document backporting
- Reference the cPython dev docs for everything else.
- Test docs and package summary.

In particular this changes the author from Michael to the
testing-cabal group.

Behavior equivalent to m.configure_mock().  Patch by Kasia Jachim.

Patch by Håkan Lövdahl.

Patch by Håkan Lövdahl.

implementation in issue #21408 they are redundant.

Fixed an output of sets in examples.

Printout of keyword args should be in deterministic order in
a mock function call. This will help to write better doctests.

It raises AssertionError if the mock has been called.

It raises `AttributeError` incase of an attribute startswith assert
or assret.

Closes issue 21239. unittest.mock.patch.stopall() did not work deterministically when the same name was patched multiple times.

Passing name keyword argument to mock.create_autospec now works.