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.

Patch by Michael Ford.

as reported by Serhiy Storchaka and Matthew Barnett.

Issue #17015: When it has a spec, a Mock object now inspects its signature when matching calls, so that arguments can be matched positionally or by name.

Close #14857: fix regression in references to PEP 3135 implicit __class__ closure variable. Reopens issue #12370, but also updates unittest.mock to workaround that issue

Fixes up minor descrepancies with cPython initial import.

(PyTypeObject, PyMethodDescr_Type, _PyMethodWrapper_Type, and
PyWrapperDescr_Type) have been modified to provide introspection
information for builtins.  Also: many additional Lib, test suite, and
Argument Clinic fixes.

Author: Larry Hastings <larry@hastings.org>