* 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 e42339d3)

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.

list_cases() now unload modules, as the test runner does, to prevent
a failure in test_xpickle about test.pickletester loaded after
loading test_cpickle:

./python -m test --list-cases test_cpickle test_xpickle

Copy Lib/test/test_robotparser.py from master to 2.7 and adapt it for
Python 2.7:

* Replace urllib.robotparser with robotparser
* Adjust HTTPServer import
* Replace io.StringIO with StringIO.StringIO
* Remove tests on crawl_delay() and request_rate() since these
  methods were added to Python 3
* Remove subTest()
* Add test_main() which explicitly lists all test cases

Patch based on the commit 4da0fd06
written by Berker Peksag.
Co-Authored-By: Berker Peksag <berker.peksag@gmail.com>

* Rename again Lib/test/bisectcmd.py to Lib/test/bisect.py
* regrtest now removes '' and Lib/test/ from sys.path
* Use absolute import in test_bisect

Revert test_bisect.py change:
remove "from __future__ import absolute_import".