(cherry picked from commit 3a9ccee0)
Co-authored-by: Marcel Plch <gmarcel.plch@gmail.com>

(cherry picked from commit 1d87c7b8)
Co-authored-by: Alex Gaynor <alex.gaynor@gmail.com>

(cherry picked from commit 0c1c4563)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

(cherry picked from commit 091e95e9)
Co-authored-by: Wolfgang Maier <wolfgang.maier@biologie.uni-freiburg.de>

* Add a test for frozen with unhashable field value.
* Improve a comment.
(cherry picked from commit 74940913)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

This removes a hack and replaces it with a proper
mapping {'list': 'List', 'dict': 'Dict', ...}.
(cherry picked from commit 2a363d29)
Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>

(cherry picked from commit ee566fe5)
Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>

Different paths are executed for normal exit and for leaving
the 'async with' block with 'break', 'continue' or 'return'.
(cherry picked from commit 2eeac269)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

when __aenter__() or __aexit__() return non-awaitable object.
(cherry picked from commit a68f2f05)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

Py_UNICODE is deprecated since Python 3.3.
But the deprecation is missed in the c-api/arg document.
(cherry picked from commit 42ec1907)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

(cherry picked from commit dfbbbf16)
Co-authored-by: hui shang <shangdahao@gmail.com>

(cherry picked from commit c869529e)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit 629338f1)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

(cherry picked from commit badb894b)
Co-authored-by: Andrés Delfino <34587441+andresdelfino@users.noreply.github.com>

(cherry picked from commit d1c82c5c)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

Followup to primary PR for the issue, GH-6344.
(cherry picked from commit 55966f3a)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

A 'u' string prefix cannot be paired with either 'r' or 'f'.  Consistently
color as much of the prefix, starting at the right, as is valid.
(cherry picked from commit da58533a)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

(cherry picked from commit 79760ed2)
Co-authored-by: Gregory P. Smith <greg@krypto.org>

(cherry picked from commit 5a7092de)
Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>

(cherry picked from commit aa8e51f5)
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

(cherry picked from commit 233de021)
Co-authored-by: Mike DePalatis <mike@depalatis.net>

(cherry picked from commit 69f5c733)
Co-authored-by: Nick Coghlan <ncoghlan@gmail.com>

(cherry picked from commit 52199520)
Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

Build and link with private copy of Tcl/Tk 8.6 for the macOS 10.6+
installer. The 10.9+ installer variant already does this.  This means that
the Python 3.7 provided by the python.org macOS installers no longer need or
use any external versions of Tcl/Tk, either system-provided or user-
installed, such as ActiveTcl.

(cherry picked from commit 78553138)
Co-authored-by: Julien Palard <julien@palard.fr>

(cherry picked from commit 79c3bab3)
Co-authored-by: Julien Palard <julien@palard.fr>

Most of them have been added in 3.7.
(cherry picked from commit bac2d5ba)

(cherry picked from commit aa50bf08)
Co-authored-by: Antoine Pitrou <pitrou@free.fr>

(cherry picked from commit 40a536be)
Co-authored-by: INADA Naoki <methane@users.noreply.github.com>

(cherry picked from commit c0518cde)
Co-authored-by: Ned Deily <nad@python.org>

Forcing the macOS IDLE.app gui process to launch in 32-mode was
a necessary hack for old versions of Tk (Aqua Carbon as in Tk 8.4
and early versions of 8.5); it is not needed for current versions
of Tk.  Since 32-bit launching will no longer be supported on
future releases of macOS, allow IDLE.app to launch in 64-bit mode.
(cherry picked from commit df532ab7)
Co-authored-by: Ned Deily <nad@python.org>

(cherry picked from commit e52ac045)
Co-authored-by: Ned Deily <nad@python.org>

* Also in docs
(cherry picked from commit 65a34709)
Co-authored-by: Sam Dunster <me@sdunster.com>

(cherry picked from commit 30e507df)
Co-authored-by: Barry Warsaw <barry@python.org>

(cherry picked from commit da1734c5)
Co-authored-by: Cheryl Sabella <cheryl.sabella@gmail.com>

This also fixes python/typingGH-512
This also fixes python/typingGH-511

As was discussed in both issues, some typing forms deserve to be treated
as immutable by copy and pickle modules, so that:
* copy(X) is X
* deepcopy(X) is X
* loads(dumps(X)) is X  GH- pickled by reference

This PR adds such behaviour to:
* Type variables
* Special forms like Union, Any, ClassVar
* Unsubscripted generic aliases to containers like List, Mapping, Iterable

This not only resolves inconsistencies mentioned in the issues, but also
improves backwards compatibility with previous versions of Python
(including 3.6).

Note that this requires some dances with __module__ for type variables
(similar to NamedTuple) because the class TypeVar itself is define in typing,
while type variables should get module where they were defined.

https://bugs.python.org/issue32873
(cherry picked from commit 83494037)
Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>