python / cpython

Enable Sphinx 3.2 "c_allow_pre_v3" option and disable the
c_warn_on_allowed_pre_v3 option to make the documentation compatible
with Sphinx 2 and Sphinx 3.

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Rename 5 test method names in test_codecs and test_typing.

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Automerge-Triggered-By: @tiran

Port the _multiprocessing extension module to multiphase initialization (PEP 489).

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.

cc @pganssle

Automerge-Triggered-By: @pganssle

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.

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.

PEP 8 style and new comments.

…H-20958)

Co-Authored-By: Jonathan Gossage <jgossage@gmail.com>

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.html#how-do-i-write-a-function-with-output-parameters-call-by-reference).

This patch make the output hint just like prefix code block.

… the GC docs (GH-21703)

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

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.

…to YAML files (GH-21776)

gdb 9.2 on Fedora Rawhide is not reliable, see:

* https://bugs.python.org/issue41473
* https://bugzilla.redhat.com/show_bug.cgi?id=1866884

PyUnicodeEncodeError_Create has been deprecated with
`Py_DEPRECATED` macro. But it was not documented.