bpo-41025: Fix subclassing for zoneinfo.ZoneInfo (GH-20965) (GH-21876)

Prior to this change, attempting to subclass the C implementation of
zoneinfo.ZoneInfo gave the following error:

    TypeError: unbound method ZoneInfo.__init_subclass__() needs an argument

https://bugs.python.org/issue41025
(cherry picked from commit 87d8287865e5c9f137f6b5cf8c34c2c509eb5e9d)

Co-authored-by: Paul Ganssle <paul@ganssle.io>

bpo-41410: Fix outdated info in mkstemp docs (GH-21701)

Automerge-Triggered-By: @ericvsmith
(cherry picked from commit e55de68be3e5b977a17d3c0ac9805b0feff8fedc)

Co-authored-by: Rishav Kundu <rk@rishav.io>

bpo-41526: Fixed layout of final page of the installer (GH-21871)

(cherry picked from commit 6444ca946984c638c67a72aac22fd6d3cc650c16)

Co-authored-by: Steve Dower <steve.dower@python.org>

Fixed comment about pathlib.link_to: it was added in 3.8, not changed. (GH-21851)

(cherry picked from commit a3eae43aeedb6e6a31adeab3c0c90961d05ab113)

Co-authored-by: Facundo Batista <facundo@taniquetil.com.ar>

bpo-41066: Update the comparison section for os vs pathlib (GH-21261)

(cherry picked from commit 0eb9deb4a62e6d9daa82bc2f67d1075864ca8ece)

Co-authored-by: Srinivas Reddy Thatiparthy (శ్రీనివాస్ రెడ్డి తాటిపర్తి) <thatiparthysreenivas@gmail.com>

[3.9] bpo-41520: Fix second codeop regression (GH-21848)

Fix the repression introduced by the initial regression fix.

(cherry picked from commit c818b15fa59039de67022c29085d439fa5d3ef95)
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

[3.9] bpo-40979: refactored typing.rst; (mostly) same content, new sub-sections and ordering (GH-21574) (#21843)

Also added PEP 585 deprecation notes.

(cherry picked from commit ab72fdeb82)

Co-authored-by: Luciano Ramalho <luciano@ramalho.org>

bpo-41520: codeop no longer ignores SyntaxWarning (GH-21838)

(cherry picked from commit 369a1cbdee14d9f27356fb3a8bb21e4fde289d25)

Co-authored-by: Victor Stinner <vstinner@python.org>

Post 3.9.0rc1

Merge tag 'v3.9.0rc1' into 3.9

Python 3.9.0rc1

[3.9] bpo-41504: Add links to asttokens, leoAst, LibCST and parso to ast docs (GH-21773) (GH-21830)

(cherry picked from commit e3c971ccfa58afcb2656b71b95e10b9703f2ad32)

Co-authored-by: Edward K. Ream <edreamleo@gmail.com>
Co-authored-by: Edward K. Ream <edreamleo@gmail.com>

Python 3.9.0rc1

bpo-41475: Fix note in "What's new in 3.7" (GH-21733) (#21832)

(cherry picked from commit 76643c10ede2813ca921464fe839e81caee21a84)

Co-authored-by: Ram Rachum <ram@rachum.com>

Add PEP 573 additions to What's New (GH-21374) (GH-21831)

(cherry picked from commit af3a6a8caefc2b202c831ab908677c1a4371cc27)

Co-authored-by: Petr Viktorin <encukou@gmail.com>

bpo-38912: regrtest logs unraisable exception into sys.__stderr__ (GH-21718) (GH-21827)

regrtest_unraisable_hook() temporarily replaces sys.stderr with
sys.__stderr__ to help to display errors when a test captures stderr.

(cherry picked from commit 701b63894fdb75b12865b9be6261ce4913da76f5)

bpo-40548: Fix "Check for source changes (pull_request)" GH Action job (GH-21806)

On Git 2.28, "git diff master..." (3 dots) no longer works when
"fetch --depth=1" is used, whereas it works on Git 2.26.

Replace "..." (3 dots) with ".." (2 dots) in the "git diff" command
computing the list of modified files between the base branch and the
PR branch.
(cherry picked from commit eaa551702d80fd67219c48ee6a13ffb571ca360b)

Co-authored-by: Victor Stinner <vstinner@python.org>

bpo-41514: Fix buggy IDLE test (GH-21808)

test_run method test_fatal_error failed when run twice, as with
python -m test -m test_fatal_error test_idle test_idle
because func.called was not reinitialized to 0.
This bug caused a failure on a refleak buildbot.
(cherry picked from commit 416f0b71ba84fe83ee2ba4399b8a28712702980b)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

[3.9] bpo-41194: Convert _ast extension to PEP 489 (GH-21807)

* bpo-41194: Convert _ast extension to PEP 489 (GH-21293)

Convert the _ast extension module to PEP 489 "Multiphase
initialization". Replace the global _ast state with a module state.

(cherry picked from commit b1cc6ba73a51d5cc3aeb113b5e7378fb50a0e20a)

* bpo-41204: Fix compiler warning in ast_type_init() (GH-21307)

(cherry picked from commit 1f76453173267887ed05bb3783e862cb22365ae8)

Update macOS installer welcome files for 3.9.0rc. (GH-21804)

bpo-41468: Improve and test IDLE run error exit  (GH-21798)

A message box pops up when an unexpected error stops the run process.  Tell users it is likely a random glitch, but report it if not.
(cherry picked from commit f2e161c27964a59bc5ab20d96f87ba5862c6222d)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Doc: Add output to example code in programming FAQ (GH-21346)

Add output hint to document, part faq/programming, section [How do I write a function with output parameters (call by reference)?](https://docs.python.org/3/faq/programming.htmlGH-how-do-i-write-a-function-with-output-parameters-call-by-reference).

This patch make the output hint just like prefix code block.
(cherry picked from commit 67acf74c4eaf64a860cc1bcda6efe6e9cb01f89b)

Co-authored-by: Jiajie Zhong <zhongjiajie955@hotmail.com>

Improve renamed test_run.RecursionLimitTest (GH-21794)

PEP 8 style and new comments.
(cherry picked from commit 8b67bf907c51846853127176cbb2982d102a2c2d)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

bpo-41455: Provide a link to how the third generation is collected in the GC docs (GH-21703)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
(cherry picked from commit 82ca8fada15b121866530f2cdac1b7055be4a244)

Co-authored-by: Yaroslav Pankovych <31005942+P-Alban@users.noreply.github.com>

bpo-41497: Fix potential UnicodeDecodeError in dis CLI (GH-21757)

(cherry picked from commit a4084b9d1e40c1c9259372263d1fe8c8a562b093)

Co-authored-by: Konge <zkonge@outlook.com>

Doc: Add a link to tutorial page from `open()` doc (GH-21737)

Adds a link to the "Reading and Writing Files" page so users can
more easily discover how file handles are handled with the `with`
context manager vs without it.
(cherry picked from commit 705f14556545699ab615ec98f707b438f9603767)

Co-authored-by: Benjamin Kane <bbkane@users.noreply.github.com>

bpo-41490: Update ensurepip to install pip 20.2.1 and setuptools 49.2.1 (GH-21774)

Update Azure Pipelines build to use Ubuntu 18.04 and move triggers into YAML files (GH-21776)

(cherry picked from commit 102b4988b1a10d5a61034381aea15521d17c210c)

Co-authored-by: Steve Dower <steve.dower@python.org>

bpo-41473: Skip test_gdb with gdb 9.2 to work around gdb bug (GH-21768)

gdb 9.2 on Fedora Rawhide is not reliable, see:

* https://bugs.python.org/issue41473
* https://bugzilla.redhat.com/show_bug.cgi?id=1866884
(cherry picked from commit e27a51c11e10d5df79b3e48dc3e7bfedfad5a794)

Co-authored-by: Victor Stinner <vstinner@python.org>

bpo-41098: Doc: Add missing deprecated directives (GH-21162)

PyUnicodeEncodeError_Create has been deprecated with
`Py_DEPRECATED` macro. But it was not documented.
(cherry picked from commit 46e19b61d31ba99f049258efa4ff1334856a3643)

Co-authored-by: Inada Naoki <songofacandy@gmail.com>

bpo-39871: Fix an error in a news entry (GH-21749)

(cherry picked from commit 54636355805dd2877bb54fbad8d967e1ddd8b553)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

bpo-41492: Fixes the description appearing in UAC prompts on Windows (GH-21754)

(cherry picked from commit 777b611c8c5676b80898a429f71d28e59bddc49d)

Co-authored-by: Steve Dower <steve.dower@python.org>

bpo-41482: Fix error in ipaddress.IPv4Network docstring (GH-21736)

(cherry picked from commit 52f98424a55e14f05dfa7483cc0faf634a61c9ff)

Co-authored-by: Eric L. Frederich <eric.frederich@gmail.com>

bpo-40726: handle uninitalized end_lineno on ast.increment_lineno (GH-20312)

(cherry picked from commit 8f4380d2f5839a321475104765221a7394a9d649)

Co-authored-by: Batuhan Taskaya <batuhanosmantaskaya@gmail.com>

bpo-36346: Doc: Update removal schedule of legacy Unicode (GH-21479)

See PEP 623 for detail.
(cherry picked from commit 270b4ad4df795783d417ba15080da8f95e598689)

Co-authored-by: Inada Naoki <songofacandy@gmail.com>

bpo-41467: Fix asyncio recv_into() on Windows (GH-21720)

On Windows, fix asyncio recv_into() return value when the socket/pipe
is closed (BrokenPipeError): return 0 rather than an empty byte
string (b'').
(cherry picked from commit 602a971a2af3a685d625c912c400cadd452718b1)

Co-authored-by: Victor Stinner <vstinner@python.org>

bpo-38156: Fix compiler warning in PyOS_StdioReadline() (GH-21721)

incr cannot be larger than INT_MAX: downcast to int explicitly.
(cherry picked from commit bde48fd8110cc5f128d5db44810d17811e328a24)

Co-authored-by: Victor Stinner <vstinner@python.org>

bpo-41425: Make tkinter doc example runnable (GH-21706)

Co-authored-by: Ankit Chandawala <achandaw@amazon.com>
Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
(cherry picked from commit c36dbac588e1d99975f285a874bb20e9f5040af4)

bpo-41424: Remove extra words in Tkinter-Packer documentation (GH-21707)

(cherry picked from commit ecaf949cc487887883c14dff7a96e09ac9404994)

Co-authored-by: Nathan M <nathanmaynes@gmail.com>

[3.9] bpo-40360: Handle PendingDeprecationWarning in test_lib2to3. (GH-21694) (GH-21697)

(cherry picked from commit cadda52d974937069eeebea1cca4229e2bd400df)

Co-authored-by: Karthikeyan Singaravelan <tir.karthi@gmail.com>

bpo-41426 Fix grammar in curses.getmouse() documentation (GH-21677)

Automerge-Triggered-By: @brettcannon
(cherry picked from commit ba18c0b13ba3c08077ea3db6658328523823a33f)

Co-authored-by: Sebastien Williams-Wynn <s.williamswynn.mail@gmail.com>

Remove incorrect mention of method.__class__ in descriptor docs (GH-21665) (GH-21667)

closes bpo-38156: Always handle interrupts in PyOS_StdioReadline. (GH-21569)

This consolidates the handling of my_fgets return values, so that interrupts are always handled, even if they come after EOF.

 I believe PyOS_StdioReadline is still buggy in that I/O errors will not result in a proper Python exception being set. However, that is a separate issue.
(cherry picked from commit a74eea238f5baba15797e2e8b570d153bc8690a7)

Co-authored-by: Benjamin Peterson <benjamin@python.org>

[3.9] Improve blake2 comment for Victor (GH-20981) (GH-20982)

Signed-off-by: Christian Heimes <christian@python.org>
(cherry picked from commit 8a0fe7b4544ba28eeea6e16ddb646bb0b5d2918e)

Co-authored-by: Christian Heimes <christian@python.org>

Fix `List_Append` description, list is extracted at TOS1[-i] (GH-21465)

(cherry picked from commit 34cd3e9f6a87f9c50edac893b0d5ae46c4e48ee3)

Co-authored-by: Xiang Zhang <angwerzx@126.com>

bpo-41412 and bpo-40948: Windows installer updates (GH-21656)

Prevent installation on Windows 8 and earlier.
Download UCRT on demand when required (non-updated Windows 8.1 only)
Add reference to py launcher to post-install message
(cherry picked from commit 37a06cbe5c17c2aa6ad938339fd42531a8a0bea0)

Co-authored-by: Steve Dower <steve.dower@python.org>

bpo-41328: Replace mention of Hudson CI with Travis CI and AppVeyor (GH-21653)

(cherry picked from commit 5e3826785dcc64f8e1a8a7bde11b88fbb40943be)

Co-authored-by: Dmytro Litvinov <litvinov.dmytro.it@gmail.com>

[3.9] Validate the AST produced by the parser in debug mode (GH-21643) (GH-21646)

This will improve the debug experience if something fails in the produced AST. Previously, errors in the produced AST can be felt much later like in the garbage collector or the compiler, making debugging them much more difficult..
(cherry picked from commit 1332226b32da44087a55e1d71990ee6899dfd28a)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

[3.9] bpo-41045: Document debug feature of f-strings ('=') (GH-21509) (GH-21645)

Co-Authored-By: Rishi <rishi93dev@gmail.com>
(cherry picked from commit 13efaec)

Co-authored-by: amaajemyfren <32741226+amaajemyfren@users.noreply.github.com>

[3.9] bpo-40939: Use the new grammar for the grammar specification documentation (GH-19969) (#21641)

(We censor the heck out of actions and some other stuff using a custom "highlighter".)

(cherry picked from commit 72cabb2aa636272e608285f5a6ba83b62be9be4e)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>

bpo-41384: Raise TclError in tkinter.OptionMenu (GH-21601)

... when an unknown option is passed.  TypeError was being raised because a 2to3 fix was missing.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
(cherry picked from commit f1d40f941a6483b1d4ea10f1051ace7b426fb8e7)
Co-authored-by: Akuli <akuviljanen17@gmail.com>

bpo-41182 selector: use DefaultSelector based upon implementation (GH-21257)

On some platform such as VMware ESXi, DefaultSelector fails
to detect selector due to default value.
This fix adds a check and uses the correct selector depending upon
select implementation and actual call.

Fixes: [bpo-41182]()
Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>
(cherry picked from commit bcd47837a9bf4806e559b40df73869493efcce27)

Co-authored-by: Abhijeet Kasurde <akasurde@redhat.com>

bpo-41341: Recursive evaluation of ForwardRef in get_type_hints (GH-21553)

The issue raised by recursive evaluation is infinite recursion with
recursive types. In that case, only the first recursive ForwardRef is
evaluated.
(cherry picked from commit 653f420b53a3aa87316cef59de8d3f5d9e11deb4)

Co-authored-by: wyfo <joperez@hotmail.fr>

bpo-41385: Fix test_executable_without_cwd on Windows (GH-21608)

(cherry picked from commit b1a87300a06324c9fc7d6553906ed914489465aa)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

bpo-37309: NEWS for GH-41373 (GH-21612)

(cherry picked from commit af08db7bac3087aac313d052c1a6302bee7c9c89)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

bpo-39868: Add documentation for Assignment Expressions (walrus, PEP 572) (GH-18851)

(cherry picked from commit f117cef25b5ffc4db9fbe373ddb65e14f59f0397)

Co-authored-by: Shankar Jha <shankarj67@gmail.com>

bpo-41314: fixed annotations __future__ version (GH-21616)

PEP 563 was updated to change the release where `from __future__ import annotations` becomes the default (and only) behavior from 4.0 to 3.10. Update `__future__.py` and its docs to reflect this.
(cherry picked from commit 0028c14073109595e7532ec00bb1e8bf39ecfb4d)

Co-authored-by: YoSTEALTH <35307184+YoSTEALTH@users.noreply.github.com>

bpo-38731: Fix NameError in command-line interface of py_compile (GH-21617)

bpo-41373: IDLE: Fix saving files loaded with no newlines or mixed newlines (GH-21597)

Fixes regression in 3.8.4 and 3.9.0b4.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
(cherry picked from commit 0dd463c8a4269137ebed7cc29605c555030df94f)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

bpo-32528: Document the change in inheritance of asyncio.CancelledError (GH-21474)

GH-msg373510

[bpo-32528]()/GH-13528 changed `asyncio.CancelledError` such that it no longer inherits from `concurrent.futures.CancelledError`. As this affects existing code, specifically when catching the latter instead of the former in exception handling, it should be documented in the "What's new in 3.8?" document.

Automerge-Triggered-By: @1st1
(cherry picked from commit 2a5181829af394b82e8e8c917183c709ee72a2b7)

Co-authored-by: JustAnotherArchivist <JustAnotherArchivist@users.noreply.github.com>

bpo-41317: Remove reader on cancellation in asyncio.loop.sock_accept() (GH-21595)

(cherry picked from commit 0dd98c2d00a75efbec19c2ed942923981bc06683)

Co-authored-by: Alex Grönholm <alex.gronholm@nextday.fi>

bpo-41366: Fix clang warning for sign conversion (GH-21592)

(cherry picked from commit 680254a8dc64e3ada00f88a7c42d41eb02108353)

Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

bpo-4630: Fix errors in Lib/idlelib/NEWS.txt (GH-21594)

Also one in news log.
(cherry picked from commit 592527f3ee59616eca2bd1da771f7c14cee808d5)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

bpo-41364: Reduce import overhead of uuid module (GH-21586)

(cherry picked from commit bf2f76ec0976c09de79c8827764f30e3b6fba776)

Co-authored-by: Steve Dower <steve.dower@python.org>

bpo-40741: Update Windows build to include SQLite 3.32.3 (GH-21570)

(cherry picked from commit 84761c3cc4bac31d471e371c53a338686d4b0241)

Co-authored-by: Steve Dower <steve.dower@python.org>

Post 3.9.0b5

Python 3.9.0b5

Doc: fix import of asdl.py when called from outside Doc/. (GH-21529) (#21567)

(cherry picked from commit 7f03445d01d5ece41c2ceef7254002e08e8ab5a5)

Co-authored-by: Julien Palard <julien@palard.fr>

bpo-41336: Fix the error handling in zoneinfo_new_instance() (GH-21546)

Do not call PyObject_CallMethod() with a live exception (like
KeyboardInterrupt).
(cherry picked from commit eca2549f5a5048b44ca88b9555f1c62f094e3c12)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Simple Documentation fix: Missing link to return type class. (GH-21291)

Just a simple documentation fix: apply_async and map_async return a "multiprocessing.pool.AsyncResult Object", not a "result object".
(cherry picked from commit f9bf0157999cb4adbcfd7e9bf526bfa48601e128)

Co-authored-by: Volker-Weissmann <39418860+Volker-Weissmann@users.noreply.github.com>

bpo-37703: improve asyncio.gather documentation regarding cancellation (GH-15312)

These changes updates the doc to comprehensively mention the behaviour of gather.cancel()

Automerge-Triggered-By: @asvetlov
(cherry picked from commit d42528a3a2c7d79fd2e6c9f2a02f3ce12d44c8cc)

Co-authored-by: Vinay Sharma <vinay04sharma@icloud.com>

bpo-40741: Update macOS installer to use SQLite 3.32.3 (GH-20979)

(cherry picked from commit 7cf1cb36ecafabff363790d245f809d3894fbbaf)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>

bpo-41205: Document Decimal power 0 to the 0 (GH-21386)

Co-authored-by: Mark Dickinson <dickinsm@gmail.com>
(cherry picked from commit 10e466448f67850ed7bb2e2a4e7f017f2b050cad)

Co-authored-by: Srinivas Reddy Thatiparthy (శ్రీనివాస్ రెడ్డి తాటిపర్తి) <thatiparthysreenivas@gmail.com>

bpo-41295: Reimplement the Carlo Verre "hackcheck" (GH-21528)

Walk down the MRO backwards to find the type that originally defined the final `tp_setattro`, then make sure we are not jumping over intermediate C-level bases with the Python-level call.

Automerge-Triggered-By: @gvanrossum
(cherry picked from commit c53b310e5926266ce267c44a168165cacd786d6e)

Co-authored-by: scoder <stefan_ml@behnel.de>

bpo-39603: Prevent header injection in http methods (GH-18485)

reject control chars in http method in http.client.putrequest to prevent http header injection
(cherry picked from commit 8ca8a2e8fb068863c1138f07e3098478ef8be12e)

Co-authored-by: AMIR <31338382+amiremohamadi@users.noreply.github.com>

bpo-41325: Add version note for args and kwargs property in call object (GH-21525)

(cherry picked from commit 9b01c598ca2576a1056816e85dd84bf5f9c74688)

Co-authored-by: Jordan Speicher <uSpike@users.noreply.github.com>

bpo-41024: doc: Explicitly mention use of 'enum.Enum' as a valid container for '… (GH-20964) (GH-21527)

bpo-41304: Update NEWS to include CVE-2020-15801 reference (GH-21521)

(cherry picked from commit 164b04c47e61bd35d55e61bc74f9fd646eba81bb)

Co-authored-by: Steve Dower <steve.dower@python.org>

bpo-41300: IDLE - save files with non-ascii chars  (GH-21512)

Fix regression released in 3.9.0b4 and 3.8.4.
(cherry picked from commit 38d3864efe914fda64553e2ec75c9ec15574483f)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Fix trivial typo in the PEG string parser (GH-21508)

(cherry picked from commit 0275e0452a773976827c2b9bd1e598ee08e2d7f5)

Co-authored-by: Eric V. Smith <ericvsmith@users.noreply.github.com>

Fix possibly-unitialized warning in string_parser.c. (GH-21503)

GCC says
```
../cpython/Parser/string_parser.c: In function ‘fstring_find_expr’:
../cpython/Parser/string_parser.c:404:93: warning: ‘cols’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  404 |     p2->starting_col_offset = p->tok->first_lineno == p->tok->lineno ? t->col_offset + cols : cols;
      |                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
../cpython/Parser/string_parser.c:384:16: note: ‘cols’ was declared here
  384 |     int lines, cols;
      |                ^~~~
../cpython/Parser/string_parser.c:403:45: warning: ‘lines’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  403 |     p2->starting_lineno = t->lineno + lines - 1;
      |                           ~~~~~~~~~~~~~~~~~~^~~
../cpython/Parser/string_parser.c:384:9: note: ‘lines’ was declared here
  384 |     int lines, cols;
      |         ^~~~~
```

and, indeed, if `PyBytes_AsString` somehow fails, lines & cols will not be initialized.
(cherry picked from commit 2ad7e9c011b7606c5c7307176df07419a0e60134)

Co-authored-by: Benjamin Peterson <benjamin@python.org>

Remove unnecessary spaces in code blocks in urllib.parse.rst (GH-21500)

This should also fix the syntax highlighting for these code blocks

Automerge-Triggered-By: @csabella
(cherry picked from commit 5e5c0f98667c9280c6d27b3db98a6cad2cc89077)

Co-authored-by: Christopher Yeh <chrisyeh96@users.noreply.github.com>

bpo-41304: Ensure python3x._pth is loaded on Windows (GH-21495)

(cherry picked from commit 936a66094591dc0e67d4a60c170148bb700ec016)

Co-authored-by: Steve Dower <steve.dower@python.org>

bpo-40150: Fix mismatched argument in RegisterWaitForSingleObject() call (GH-19686)

(cherry picked from commit af4eda46d1538b1da700a86588bdb94b0a4d1ff2)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Fix -Wstring-prototypes warnings in _zoneinfo.c. (GH-21478)

(cherry picked from commit 0108b2a2401d0ffffe7c07e5ab69a3b0c7593070)

Co-authored-by: Benjamin Peterson <benjamin@python.org>

Fix -Wstrict-prototypes warning in thread_pthread.h. (GH-21477)

(cherry picked from commit ea62a4bd54421693ed6b24a1bbd18ebed3bdb8f8)

Co-authored-by: Benjamin Peterson <benjamin@python.org>

bpo-41302: Fix build with system libmpdec (GH-21481)

Move definition of UNUSED from modified headers of libmpdec to
_decimal.c itself. This makes the vendored source closer to the
standalone library and fixes build with --with-system-libmpdec.

Tested to build fine with either system libmpdec or the vendored one.
(cherry picked from commit 015efdbef7454a522e88cd79ba2b4cd77a5fb2a2)

Co-authored-by: Felix Yan <felixonmars@archlinux.org>

[3.9] bpo-39017: Avoid infinite loop in the tarfile module (GH-21454) (GH-21482)

Avoid infinite loop when reading specially crafted TAR files using the tarfile module
(CVE-2019-20907).
(cherry picked from commit 5a8d121a1f3ef5ad7c105ee378cc79a3eac0c7d4)

Co-authored-by: Rishi <rishi_devan@mail.com>
Automerge-Triggered-By: @encukou

Fix repeated words in Classes tutorial (GH-21455)

The phrase "At any time during execution," was repeated twice.

Automerge-Triggered-By: @Mariatta
(cherry picked from commit 4f28f75deefc6e8f65694f96f1a40b0a26fc385d)

Co-authored-by: Paul McMillan <paul@mcmillan.ws>

bpo-41288: Fix a crash in unpickling invalid NEWOBJ_EX. (GH-21458)

Automerge-Triggered-By: @tiran
(cherry picked from commit 4f309abf55f0e6f8950ac13d6ec83c22b8d47bf8)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>

bpo-41228: Fix /a/are/ in monthcalendar() descripton (GH-21372)

(cherry picked from commit 344dce312a0cf86d5a5772d54843cc179acaf6e3)

Co-authored-by: Nima Dini <nima.dini@gmail.com>

Fix typo in docs: 'created by th' -> 'created by the' (GH-21384)

(cherry picked from commit 6fc732a2116e2c42b0431bb7e2a21719351af755)

Co-authored-by: marload <rladhkstn8@gmail.com>

bpo-41175: Guard against a NULL pointer dereference within bytearrayobject (GH-21240)

The issue is triggered by the bytearray() + bytearray() operation.

Detected by GCC 10 static analysis tool.
(cherry picked from commit 61fc23ca106bc82955b0e59d1ab42285b94899e2)

Co-authored-by: stratakis <cstratak@redhat.com>

bpo-37765: Add keywords to IDLE tab completions (GH-15138)

Keywords are present in the main module tab completion lists generated by rlcompleter, which is used by REPLs on *nix. Add all keywords to IDLE's main module name list except those already added from builtins (True, False, and None) . This list may also be used by Show Completions on the Edit menu, and its hot key.

Rewrite Completions doc.

Co-authored-by: Cheryl Sabella <cheryl.sabella@gmail.com>
(cherry picked from commit bce2eb4646021910aa4074d86f44a09b32d0b2b2)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

bpo-41172: Fix check for compiler in test suite (GH-21400)

(cherry picked from commit af56c4fc76ac39ce76d649d7bebf7f78c1add4fa)

Co-authored-by: Steve Dower <steve.dower@python.org>

bpo-41199: Docstring convention not followed for dataclasses documentation page (GH-21413)

Automerge-Triggered-By: @ericvsmith
(cherry picked from commit 61bb24a270d15106decb1c7983bf4c2831671a75)

Co-authored-by: marload <rladhkstn8@gmail.com>

bpo-41252: Fix incorrect refcounting in _ssl.c's _servername_callback() (GH-21407)

(cherry picked from commit ee96f32ca24779656d3c8736d26671fc3689f0a3)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

bpo-40597: Allow email.contextmanager set_content() to set a null string. (GH-20542)

(cherry picked from commit 4fa61a7732923f92de0f7830c12da48c4cec937f)

Co-authored-by: Mark Sapiro <mark@msapiro.net>

bpo-41247: asyncio.set_running_loop() cache running loop holder (GH-21401)

The running loop holder cache variable was always set to NULL when
calling set_running_loop.

Now set_running_loop saves the newly created running loop holder in the
cache variable for faster access in get_running_loop.

Automerge-Triggered-By: @1st1
(cherry picked from commit 529f42645d38b6b0075f256814dfb3d220ac7d92)

Co-authored-by: Tony Solomonik <tony.solomonik@gmail.com>

Revert "bpo-40170: PyType_HasFeature() now always calls PyType_GetFlags() (GH-19378)" (GH-21390)

This partially reverts commit 45ec5b99aefa54552947049086e87ec01bc2fc9a.
(cherry picked from commit b26a0db8ea2de3a8a8e4b40e69fc8642c7d7cb68)

Co-authored-by: Victor Stinner <vstinner@python.org>

closes bpo-41235: Fix the error handling in SSLContext.load_dh_params() (GH-21385)

(cherry picked from commit aebc0495572c5bb85d2bd97d27cf93ab038b5a6a)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>