This mitigates the current Aqua Tk refresh problem on OS X 10.9
by backporting 2.7.x behavior and is transparent to the user.

- cross-references and attributions for inspect changes
- note improvements to inspect and pydoc handling of
  metaclasses and dynamic attributes (courtesy of the
  enum PEP)
- group all CPython implementation specific changes
  into a common section
- add see also links for most of the PEPs
- fix the see also link for the release PEP
- add suitable caveats on Argument Clinic inclusion
- clarify the change to __wrapped__ handling

Make it easier for users to make use of the backup _tkinter linked
with the third-party Tcl and Tk frameworks in /Library/Frameworks.
The two tkinter variants are now installed in separate directories
under a new lib-tkinter.  This allows per-user selection by
manipulating sys.path, directly or with PYTHONPATH.  If this
proves useful, we can supply a more convenient user interface
to supply the paths.  For now, this remains somewhat experimental.

Make it easier for users to make use of the backup _tkinter linked
with the third-party Tcl and Tk frameworks in /Library/Frameworks.
The two tkinter variants are now installed in separate directories
under a new lib-tkinter.  This allows per-user selection by
manipulating sys.path, directly or with PYTHONPATH.  If this
proves useful, we can supply a more convenient user interface
to supply the paths.  For now, this remains somewhat experimental.

- added test cases to ensure docstrings are reasonable
- also updates various comments in contextlib for accuracy
- identifed #19404 as an issue making it difficult to provide
  good help output on generator based context manager instances

available to compute timeout.

compute timeout.

Change Thread.join() with a negative timeout to just return.  The
behavior isn't documented then, but this restores previous
behavior.

10.8+ when using a universal Python that included a PPC architecture,
such as with a python.org 32-bit-only binary installer.

are individually controlled by #ifdef statements in the extension
code.

Issue #19375: The site module adding a "site-python" directory to sys.path, if it exists, is now deprecated.

Issue #11161: Update the documentation for ProcessPoolExecutor to note that it will not work in the interactive shell.

being defined on top of __name__.

source importlib.

unittest.TestCase in prep of running tests under frozen and source
importlib.