Based on suggestion from Fumihiro Bessho.

Based on patch by Patrila.

Patch by Dhushyanth Ramasamy.

WeakValueDictionary when collecting from another thread.

…gative integers.

….textpad.Textbox.

Based on patch by Tycho Andersen.

…ject and modes

"w" now are relative to the start of the file.

…eful (python#29057)

…tch by Masayuki Yamamoto

…tic seeds for random.

…ation

…ode.

Patch by jan matejek and Xiang Zhang.

In urllib, suffixes in no_proxy environment variable with
leading dots could match related hostnames again (e.g. .b.c matches a.b.c).
Patch by Milan Oberkirch.

Issue python#29188: Support glibc 2.24 on Linux: don't use getentropy() function but
read from /dev/urandom to get random bytes, for example in os.urandom().  On
Linux, getentropy() is implemented which getrandom() is blocking mode, whereas
os.urandom() should not block.

…thonGH-2137)

(cherry picked from commit dc980df)

…#2151)

(cherry picked from commit d79c1d4)

PyNumber_Int() creates a new reference: need to decrement result
reference counter.

Add a test to check the current MAGIC_NUMBER against the
expected number for the release if the current release is
at candidate or final level. On test failure, describe to
the developer the procedure for changing the magic number.

This ensures that pre-merge CI will automatically pick up
on magic number changes in maintenance releases (and
explain why those are problematic), rather than relying on
all core developers to be aware of the implications of
such changes.

…honGH-2159) (python#2168)

* bpo-24484: Avoid race condition in multiprocessing cleanup

The finalizer registry can be mutated while inspected by multiprocessing
at process exit.

* Use test.support.start_threads()

* Add Misc/NEWS.
(cherry picked from commit 1eb6c00)

…nGH-2190)

Replace platform with platforms.
(cherry picked from commit 4ebf03d)

…honGH-2173) (pythonGH-2196)

(cherry picked from commit 184bd82)

…n#2202)

* bpo-29591: Upgrade Modules/expat to libexpat 2.2

* bpo-29591: Restore Python changes on expat

* bpo-29591: Remove expat config of unsupported platforms

Remove the configuration (Modules/expat/*config.h) of unsupported
platforms:

* Amiga
* MacOS Classic on PPC32
* Open Watcom

* bpo-29591: Remove useless XML_HAS_SET_HASH_SALT

The XML_HAS_SET_HASH_SALT define of Modules/expat/expat.h became
useless since our local expat copy was upgrade to expat 2.1 (it's now
expat 2.2.0).

(cherry picked from commit 23ec4b5)

regrtest now warms up caches: create explicitly all internal
singletons which are created on demand to prevent false positives
when checking for reference leaks.

…rtest (python#2249)

[2.7] bpo-30540, bpo-30523: Add --matchfile and --list-cases options to regrtest

…scape (python#2174)

- The purpose of `obj` in the example is implicit
- As an argument the `obj` will cause errors when using `Cell('b10').value` because it expects more arguments, but 1 given