(cherry picked from commit feabae96)
Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>

(cherry picked from commit 28f07364)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

(cherry picked from commit 56d8f57b)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

(cherry picked from commit c9265c15)
Co-authored-by: Jon Ribbens <jribbens@gmail.com>

It was added in test_functools at 445f1b35.
(cherry picked from commit 9e9b2c32)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Replace deprecated inspect.getfullargspec() with inspect.signature().
(cherry picked from commit 35c08091)
Co-authored-by: Nicolas Noé <nicolas@niconoe.org>

Check that the size of the varnames tuple is enough at least for all arguments.
(cherry picked from commit bd47384e)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit 15c7b2ab)
Co-authored-by: Benjamin Peterson <benjamin@python.org>

`_PyUnicode_TransformDecimalAndSpaceToASCII()` missed trailing NUL char.
It caused buffer overflow in `_Py_string_to_number_with_underscores()`.

This bug is introduced in 9b6c60cb.
(cherry picked from commit 16dfca4d)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

* Add test capturing failure.
* Honor newlines as present in the original file.
(cherry picked from commit cafaf044)
Co-authored-by: Jason R. Coombs <jaraco@jaraco.com>

(cherry picked from commit 379e9d63)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

The test failed on AMD64 Debian root 3.x buildbot because the busy
loop of 100 ms only increased time.thread_time() by 19.9 ms which is
smaller than 20 ms. Modify the test to tolerate a delta of at least
15 ms instead of 20 ms.
(cherry picked from commit d6345def)
Co-authored-by: Victor Stinner <vstinner@redhat.com>

Increase the timeout from 1 min to 5 min.

Replace also time.time() with time.monotonic() for timeouts.
(cherry picked from commit 3ad8decd)
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

(cherry picked from commit 993030aa)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit 504373c5)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

This code does not appear to be used anywhere in the python code base.
The use was removed in eb81795d.
(cherry picked from commit b91a3a0d)
Co-authored-by: Eitan Adler <grimreaper@users.noreply.github.com>

Change test_logging.SMTPHandlerTest timeout from 8 seconds to 1
minute. The test failed randomly on the slow x86 Gentoo Refleaks 3.7
buildbot.
(cherry picked from commit 31b50b8c)
Co-authored-by: Victor Stinner <vstinner@redhat.com>

(cherry picked from commit 5e5bbbec)
Co-authored-by: Stig Johan Berggren <stigjb@gmail.com>

(cherry picked from commit 33aefad3)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

Dataclasses: Fix example on 30.6.8, add method should receive a list rather than an integer. (GH-8038) (GH-8237)

Change example function to append rather than add lists.
(cherry picked from commit da5e9476)
Co-authored-by: Tom Faulkner <tomfaulkner@gmail.com>

The ValueError message ends with a period.
(cherry picked from commit 9cffdbff)
Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>

Many users won't realise the implications the OpenSSL 1.0.2
minimum version requirement has when it comes to Ubuntu
14.04 and Debian 8, so expand on that in the platform support
section.

Also explicitly note the non-ASCII-based locale requirement for
full Unicode text handling support on non-Windows systems.
(cherry picked from commit 5fe7c98a)
Co-authored-by: Nick Coghlan <ncoghlan@gmail.com>

Contributed by Bradley Laney.
(cherry picked from commit 6b490b5d)
Co-authored-by: Bradley Laney <bradley.laney@gmail.com>

(cherry picked from commit 445f1b35)
Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>

(cherry picked from commit 7762e4d3)
Co-authored-by: Benjamin Peterson <benjamin@python.org>

(cherry picked from commit d6d44327)
Co-authored-by: Benjamin Peterson <benjamin@python.org>

Follow up from https://github.com/python/peps/pull/712GH-issuecomment-403591108:

"people using the repo without using GitHub still ought to be reminded of the COC" - GvR
(cherry picked from commit 3ed91929)
Co-authored-by: Mariatta <Mariatta@users.noreply.github.com>

Initial patch by Joshua Jay Herman.
(cherry picked from commit 9863de03)
Co-authored-by: Berker Peksag <berker.peksag@gmail.com>

(cherry picked from commit f60bf0e1)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Fixed also testing the "always" warning filter.
(cherry picked from commit b796e7dc)
Co-authored-by: Sergey Fedoseev <fedoseev.sergey@gmail.com>

Include a more easily understood example for nullcontext
(cherry picked from commit c287545d)
Co-authored-by: Daniel Porteous <danielporteous1@gmail.com>

The 'output formatting' section of the tutorial talks a lot about manual formatting with things like .rjust() and .zfill(), with only a passing reference to 3.6's new f-strings.

This doesn't drop all of the old material, but it does rearrange the topics into a more modern order: f-strings first, discussing formatting specifiers a bit; then calling .format(); finally manual formatting with .ljust().
(cherry picked from commit ced350b1)
Co-authored-by: Andrew Kuchling <amk@amk.ca>

This will prevent emitting a resource warning when the execution was
interrupted by Ctrl-C between calling open() and entering a 'with' block
in "with open()".
(cherry picked from commit 3f4d90d4)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit 2a9b8bab)

(cherry picked from commit f85af035)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

(cherry picked from commit bc9aa813)
Co-authored-by: Marcin Niemira <marcin@niemira.net>

webbrowser._synthesize() called webbrowser.register() with
outdated signature.
Co-Authored-By: John Still <john@jmsdvl.com>
(cherry picked from commit 25b804a9)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Make the change where discussing the CPython implementation of lists and dicts.
(cherry picked from commit 8d412780)
Co-authored-by: Andrés Delfino <adelfino@gmail.com>

(cherry picked from commit 9c5ba097)
Co-authored-by: Marcin Niemira <marcin@niemira.net>