[2.7] bpo-28261: Prevent raising SystemError where PyArg_ParseTuple is used to parse non-args. (#3213)

Use self.addCleanup(self.server.stop) to stop the HTTP server. Some
tests didn't stop the server like test_https().

* bpo-30871: Add test.pythoninfo (#3075)

* Add Lib/test/pythoninfo.py: script collecting various informations
  about Python to help debugging test failures.
* regrtest: remove sys.hash_info and sys.flags from header.
* Travis CI, Appveyor: run pythoninfo before tests
(cherry picked from commit b907abc8)

* bpo-30871: pythoninfo: add expat and _decimal (#3121)

* bpo-30871: pythoninfo: add expat and _decimal

* Remove _decimal.__version__

The string is hardcoded, not really interesting.

(cherry picked from commit f6ebd838)

* bpo-30871: Add "make pythoninfo" (#3120)

(cherry picked from commit a3a01a2f)

* bpo-30871: pythoninfo: more sys, os, time data (#3130)

* bpo-30871: pythoninfo: more sys, os, time data

PythonInfo now converts types other than intger to string by default.

* fix typo

(cherry picked from commit ad7eaed5)

* bpo-31231: Fix pythoninfo in Travis config (#3134)

bpo-31231, bpo-30871: Replace "./python -m test.pythoninfo" with
"make pythoninfo", since macOS uses ./python.exe.
(cherry picked from commit 92b1f901)

(cherry picked from commit 29d007bb670b486788f73c2d742b0ad0b679ff13)

Check "tests" before its value is replaced.

Add the CPU count in the header.

* bpo-30947: Update libexpat from 2.2.1 to 2.2.3

* Add NEWS entry

* Add new loadlibrary.c

* expat_external.h: restore include "pyexpatns.h"

* PCbuild: add expat/loadlibrary.c

* Define XML_POOR_ENTROPY to compile expat

Python 2.7 backport: add expat/loadlibrary.c to PC/VS9.0/ project
files (_elementtree and pyexpat).

(cherry picked from commit 93d0cb58)

The `Show Source` was broken because of a change made in sphinx 1.5.1
In Sphinx 1.4.9, the sourcename was "index.txt".
In Sphinx 1.5.1+, it is now "index.rst.txt".

(cherry picked from commit b9ff4987)

* bpo-31221: patchcheck ignores external libraries (#3109)

Tools/scripts/patchcheck.py now ignores changes in directories which
are copies of external libraries:

* Modules/_ctypes/libffi_msvc/
* Modules/_ctypes/libffi_osx/
* Modules/_decimal/libmpdec/
* Modules/expat/
* Modules/zlib/

Drop also support for Mercurial, since CPython migrated to Git.

Exclude also libmpdec

patchcheck: exclude also libffi_osx and libffi_msvc
(cherry picked from commit 4a347ce4)

* Exclude also Modules/_ctypes/libffi on Python 2.7

* Remove _decimal/libmpdec, not in Python 2.7

Change the option for `Français` into `French` to be consistent with the other language selections that are already in English.
(cherry picked from commit b616b972)

Fix a warning about dangling processes in test_rapid_restart() of
_test_multiprocessing: join the process.
(cherry picked from commit 17657bb9)

OpenSSL 1.1.0 to 1.1.0e aborted the handshake when server and client
could not agree on a protocol using ALPN. OpenSSL 1.1.0f changed that.
The most recent version now behaves like OpenSSL 1.0.2 again. The ALPN
callback can pretend to not been set.

See https://github.com/openssl/openssl/pull/3158 for more details
Signed-off-by: Christian Heimes <christian@python.org>
(cherry picked from commit a5c1bab352671e043645163ca50c5211aa657acd)

* bpo-31159: fix language switch regex on unknown yet built languages. (#3039)

This fix a regex issue (a missing non-matching group around an 'or'
list) and the specific possible case where a translation is built but
not yet in known by the picker, but not explicitly listing possible
languages in the regex.
(cherry picked from commit 122081de)

* bpo-31149: Doc: Add Japanese to the language switcher. (#3028)

(cherry picked from commit c82b7f33)

(cherry picked from commit e8e7fba0b24582959feca9c31f2a72fc0251f83d)

test_subprocess now also calls reap_children() in tearDown(), not
only on setUp().
(cherry picked from commit cc42c121)

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)