The current test_child_terminated_in_stopped_state() function test
creates a child process which calls ptrace(PTRACE_TRACEME, 0, 0) and
then crash (SIGSEGV). The problem is that calling os.waitpid() in the
parent process is not enough to close the process: the child process
remains alive and so the unit test leaks a child process in a
strange state. Closing the child process requires non-trivial code,
maybe platform specific.

Remove the functional test and replaces it with an unit test which
mocks os.waitpid() using a new _testcapi.W_STOPCODE() function to
test the WIFSTOPPED() path.
(cherry picked from commit 7b7c6dcf)

* bpo-31160: regrtest now reaps child processes (#3044)

Add a post_test_cleanup() function which currently only calls
support.reap_children().
(cherry picked from commit e3510d74)

* bpo-31160: test_tempfile: Fix reap_children() warning (#3056)

TestRandomNameSequence.test_process_awareness() now calls
os.waitpid() to avoid leaking a zombie process.
(cherry picked from commit 6c8c2943)

bpo-31133: Downgrade PCbuild/pcbuild.sln from format version 12.00 to
11.00 to support Visual Studio 2010 and newer, not only VS 2013 and
newer.

[2.7] bpo-31150: Wait for child process in test_forkinthread to avoid thread reaped warnings (#3042)

bpo-31135: Call the parent destroy() method even if the used
attribute doesn't exist.

The LabeledScale.destroy() method now also explicitly clears label
and scale attributes to help the garbage collector to destroy all
widgets.

* Doc: Indicate the language

* Renaming version_switcher to switchers (to add language_switcher).

* Adding language switch.

* Doc switchers: Enhance readability of regex parsing versions.

* Doc switchers: Desambiguate the need of a replace(/\/+$/g, '') by proper naming.

* Doc switchers: py3k can't reach js, it's redirected server-side by nginx.

* Doc switchers: Examples matching actual regexes.

* Doc switchers: Better fallback on unexisting translated version.

(cherry picked from commit dff9b5f9)

(cherry picked from commit c4c98660)

Change the shadowing naming, 'value' (Python-ast.c:3814), to 'val'
to prevent the variables from being misused.

Mention that it warns about features that are significantly changed in Python 3
and can’t be detected using static code analysis.

Link to Porting Python 2 Code to Python 3 doc

some builtin and extension objects that don't support pickling
explicitly and are pickled incorrectly by default (like memoryview or
staticmethod).

(cherry picked from commit e1e60bd9)

Use the copy provided in https://bugs.python.org/issue25910GH-msg295200
(cherry picked from commit 8474d871)

(cherry pick from 9cd7e176)

(cherry picked from commit 6fcb69da)

* bpo-31044: Skip test_posix.test_makedev() on FreeBSD (#2915)

There is a bug in FreeBSD CURRENT with 64-bit dev_t. Skip the test if
dev_t is larger than 32-bit, until the bug is fixed in FreeBSD
CURRENT.
(cherry picked from commit 12953ffe)

* Fix syntax for Python 2.7

* bpo-31028: Fix test_pydoc when run directly

Fix get_pydoc_link() of test_pydoc to fix "./python
Lib/test/test_pydoc.py": get the absolute path to __file__ to prevent
relative directories.

* Use realpath() instead of abspath()

(cherry picked from commit fd465611)

* bpo-30980: Fix close test to fail

test_close_twice was not considering the fact that file_wrapper is
duping the file descriptor. Closing the original descriptor left the
duped one open, hiding the fact that close protection is not effective.

* bpo-30980: Fix double close protection

Invalidated self.fd before closing, handling correctly the case when
os.close raises.

* bpo-30980: Fix fd leak introduced in the fixed test

* bpo-30778: Skip test_bsddb3 on Windows XP

* Fix if, don't skip Windows Vista

multiprocessing.Process.is_alive() now removes the process from the
_children set if the process completed.

The change prevents leaking "dangling" processes.
(cherry picked from commit 2db64823)

* bpo-30595: Fix multiprocessing.Queue.get(timeout) (#2027)

multiprocessing.Queue.get() with a timeout now polls its reader in
non-blocking mode if it succeeded to aquire the lock but the acquire
took longer than the timeout.
Co-Authored-By: Grzegorz Grzywacz <grzgrzgrz3@gmail.com>
(cherry picked from commit 1b7863c3)

* bpo-30595: Increase test_queue_feeder_donot_stop_onexc() timeout (#2148)

_test_multiprocessing.test_queue_feeder_donot_stop_onexc() now uses a
timeout of 1 second on Queue.get(), instead of 0.1 second, for slow
buildbots.
(cherry picked from commit 8f6eeaf2)

(cherry picked from commit e42339d3a08a8fde3349722def85d7a8e49899be)

Mention that TestCase.assertMultiLineEqual method is used by default when comparing Unicode string when comparing Unicode strings with assertEqual.

bpo-30850: On Windows, test04_lock_timeout2() now tolerates 50 ms
whereas 100 ms is expected. The lock sometimes times out after only
58 ms. Windows clocks have a bad resolution and bad accuracy.

(cherry picked from commit cfcd7677)

Adds a new 'Pip not installed' section that covers
running `ensurepip` manually, and also references
the relevant section of the Python Packaging User
Guide.

(cherry picked from commit b3527bfe)

Fix also regrtest command line parser to allow passing -u
extralargefile to run test_zipfile64.

(cherry picked from commit fff2a210)

encoder and decoder.
(cherry picked from commit d3aaa2f1)

(cherry picked from commit 50f58163)

encoder and decoder..
(cherry picked from commit d3aaa2f1)

* [2.7] Avoid _GNU_SOURCE redefined warning in xmlparse.c (GH-2670)
(cherry picked from commit f5232559)

* [2.7] Avoid _GNU_SOURCE redefined warning in xmlparse.c (GH-2670).
(cherry picked from commit f5232559)

If history-length is set in .inputrc, and the history file is double the
history size (or more), history_get(N) returns NULL, and python
segfaults. Fix that by checking for NULL return value.

It seems that the root cause is incorrect handling of bigger history in
readline, but Python should not segfault even if readline returns
unexpected value.

This issue affects only GNU readline. When using libedit emulation
system history size option does not work.

This is a backport of the actual fix from master without the test, since
the test depends on new run_pty() helper which is not available in 2.7.

Replace `dumps` with `json.dumps`

* bpo-30855: Trying to fix test_use on Windows.

Avoid possible weird behavior of WideInt convertion.
"winfo id" always returns string hexadecimal representation.

(cherry picked from commit b9d67249)

* bpo-30855: Trying to fix test_use on Windows.

(cherry picked from commit 29a2f7c6)
(subTest() removed since it was introduced in Python 3)

(cherry picked from commit 76c567ee)

This provides more information on test failures.