Previously a non-string, non-regex second argument and no callable
argument could cause the test to appear to always pass.

Remove useless test and unused variables. Initial patch by Andreas Schwab.

Closes #18456: Doc fix: PyDict_Update only works with dict-like objects, not key-value sequences. Patch by priyapappachan.

close the file descriptor if os.fdopen() fails

Suggested by Bruce Esrig on docs@.

Patch by Andreas Schwab.

new redirect of http://www.python.org/ to https://www.python.org.

Patch by Anastasia Filatova.

When running external programs such as a C compiler and getting an
error code, distutils only prints the program name.  With this change,
one can get the full command line by setting the DISTUTILS_DEBUG
environment variable.

This should have no compatibility issues, unless there are tools
that depend on the exact format of distutils debug messages.

Patch by Tshepang Lekhonkhobe, reviewed by Georg Brandl.

Thanks to Amaury Forgeot d’Arc and Philip J. Eby.

Original patch by Lina Clark.

Patch by Lita Cho.

it clear that any Python 3.x is not usable with the checked out Sphinx.

Patch by Gareth Rees.

as documented.  The pattern and source keyword parameters are left as
deprecated aliases.

from __future__ import unicode_literals.  Initial patch by Juancarlo Añez.

The demos at the end of turtle.py appear to be the only test, so I changed
some of the strings to unicode with a u prefix.  If os.path.isfile or the Tk
image function have problems with Unicode input, that would be different issue.

Thanks Vajrasky Kok and Zachary Ware.