Use also support.SOCK_MAX_SIZE, not only support.PIPE_MAX_SIZE, to
get the size for a blocking send into a multiprocessing pipe.

Replace also test_support with support.

* bpo-31479: Always reset the signal alarm in tests

Use "try: ... finally: signal.signal(0)" pattern to make sure that
tests don't "leak" a pending fatal signal alarm.

* Move two more alarm() calls into the try block

Fix also typo: replace signal.signal(0) with signal.alarm(0)

* Move another signal.alarm() into the try block

(cherry picked from commit 9abee722)

* bpo-33717: pythoninfo: add CC --version (GH-7290)

Python 3.6, although I've seen the same crash in 3.6 (when involving
extension types and more complicated threading setups).

(cherry picked from commit a5c42284)

Fix test_multiprocessing.test_ignore(): use support.PIPE_MAX_SIZE
to make sure that send_bytes() blocks.

It is reproduced when parse the "<>" operator and run
Python with both options -3 and -We.

Check which readline implementation is used based on the readline
docstring.

Rename Lib/test/bisect.py to Lib/test/bisect_cmd.py. The old name was
in conflict with Lib/bisect.py, causing test failures, depending how
tests were run.

For example, "python2.7 Lib/test/test_httpservers.py" imported
indirectly Lib/test/bisect.py instead of Lib/bisect.py
on "import bisect".

* Add a space to ensurepip's --altinstall option
* Add periods to the arguments of ensurepip that didn't have it

This makes --help for all optional arguments consistent and also makes it
consistent with pip --help..
(cherry picked from commit e9537ad6)
Co-authored-by: Wieland Hoffmann <mineo@users.noreply.github.com>

(cherry picked from commit 8c1ad0c4)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

Call sys.stdout.flush() after displaying "running: ...".

(cherry picked from commit 268cc7c3)

Co-authored-by: Andrés Delfino adelfino@gmail.com

Skip test_load_dh_params() of test_ssl when Python filesystem encoding
cannot encode the provided path.

* Fixed a leak when the GC fails to add an object with __del__ into
  the gc.garbage list.
* PyGC_Collect() can now be called when an exception is set and
  preserves it.
(cherry picked from commit 301e3cc8)

(cherry picked from commit d5f14426)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

(cherry picked from commit 1179f4b4)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

uuid._ipconfig_getnode did not validate the maximum length of the value,
so long as the value had the same type of formatting as a MAC address.
This let it select DUIDs as MAC addresses. It now requires an exact
length match..
(cherry picked from commit c66c342c)
Co-authored-by: CtrlZvi <viz+github@flippedperspective.com>

Fixes incorrect error text for int('1', base=1000)
and long('1', base=1000).

(cherry picked from commit bde3e0bf)

(cherry picked from commit 19177fbd)
Co-authored-by: Stéphane Wirtel <stephane@wirtel.be>

The robotparser's __str__ representation now includes wildcard
entries.
(cherry picked from commit c3fa1f2b93fa4bf96a8aadc74ee196384cefa31e)

Co-authored-by: Michael Lazar <lazar.michael22@gmail.com>.

Clarify that flush is implied when the call to write contains a newline character.
(cherry picked from commit 7ffd4c58)
Co-authored-by: Elena Oat <oat.elena@gmail.com>

(cherry picked from commit ddb6215a)

This partially reverts commit e80a232f.

[2.7] bpo-33422: Fix quotation marks getting deleted when looking up byte/string literals on pydoc. (GH-6701) (GH-6712)

Also update the list of string prefixes.
(cherry picked from commit b2043bbe)

[2.7] bpo-20087: Update locale alias mapping with glibc 2.27 supported locales. (GH-6708). (GH-6717)

(cherry picked from commit cedc9b74)

(cherry picked from commit 74382a3f)

(cherry picked from commit 9f3535c9)
Co-authored-by: Bo Bayles <bbayles@gmail.com>

(cherry picked from commit 491bbedc)
Co-authored-by: lekma <lekmalek@gmail.com>

(cherry picked from commit fc6aa28b)
Co-authored-by: Ned Deily <nad@python.org>

[2.7] bpo-33256: Replace angle brackets around python object repr to display it in html (GH-6442). (GH-6650)

(cherry picked from commit 7d68bfa8)
Co-authored-by: sblondon <sblondon@users.noreply.github.com>