delta/cpython-git.git, branch v3.9.0rc1

Python 3.9.0rc1

2020-08-11T18:58:17+00:00

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

2020-08-11T17:03:21+00:00

(cherry picked from commit 76643c10ede2813ca921464fe839e81caee21a84)

Co-authored-by: Ram Rachum

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

2020-08-11T16:34:20+00:00

(cherry picked from commit af3a6a8caefc2b202c831ab908677c1a4371cc27)

Co-authored-by: Petr Viktorin

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

2020-08-11T15:03:33+00:00

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)

2020-08-10T17:09:41+00:00

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

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

2020-08-10T14:05:02+00:00

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

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

2020-08-10T13:55:54+00:00

* 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)

2020-08-10T07:04:13+00:00

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

2020-08-09T20:26:21+00:00

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

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

2020-08-09T18:54:26+00:00

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