Issue #18937: Add an assertLogs() context manager to unittest.TestCase to ensure that a block of code emits a message using the logging module.

This test will fail because a previous attempt to fix a merge error
in site.py was incorrect, but the test wasn't running so it wasn't
caught.  The next commit will fix the site.py bug.

It now always checks, instead of only when the LICENSE file doesn't exist.  It
is also protected by the 'network' resource, and uses a HEAD request since we
are only doing an existence check.

numeric IP addresses.

Based on report and initial patch from Germán M. Bravo

Patch by Vlad Shcherbina

Patch by Vlad Shcherbina

Patch contributed by Vajrasky Kok. Addresses Issue #17324

Patch contributed by Vajrasky Kok. Addresses Issue #17324

if all necessary functions are already found in libuuid.
Patch by Evgeny Sologubov.

if all necessary functions are already found in libuuid.
Patch by Evgeny Sologubov.

- my previous removal and hg resolve mark had still left them and hooks did not catch it too!

Improve the docstring of random.shuffle. Inform users not to provide int arg.
Addresses issue #14927

Addresses issue #14927

Suggested by Wouter Bolsterlee.

Clarify mmap.close method  behavior.  Addresses issue  #18815
Patch contributed by Anoop Thomas Mathew.