delta/cpython-git.git, branch v3.9.0rc2

Python 3.9.0rc2

2020-09-16T21:23:13+00:00

bpo-41517: do not allow Enums to be extended (GH-22271)

2020-09-16T14:35:14+00:00

fix bug that let Enums be extended via multiple inheritance
(cherry picked from commit 3064dbf5df1021e85b507366a7ea448c8895efe7)

Co-authored-by: Ethan Furman

bpo-41687: Fix error handling in Solaris sendfile implementation (GH-22128)

2020-09-16T12:25:09+00:00

I just realized that my recent PR with sendfile on Solaris ([PR 22040](https://github.com/python/cpython/pull/22040)) has broken error handling.

Sorry for that, this simple followup fixes that.

Automerge-Triggered-By: @1st1
(cherry picked from commit fa8c9e70104b0aef966a518eb3a80a4881906ae0)

Co-authored-by: Jakub Kulík

[3.9] bpo-41687: Fix sendfile implementation to work with Solaris (GH-22040) (GH-22273)

2020-09-16T11:52:26+00:00

(cherry picked from commit 8c0be6fd9101746235b63ddfb84106d1e9ca286b)

Co-authored-by: Jakub Kulík

[3.9] bpo-41789: honor object overrides in Enum classes (GH-22250) (GH-22272)

2020-09-16T10:58:33+00:00

EnumMeta double-checks that `__repr__`, `__str__`, `__format__`, and `__reduce_ex__` are not the same as `object`'s, and replaces them if they are -- even if that replacement was intentionally done in the Enum being constructed.  This patch fixes that.

bpo-39587: Enum - use correct mixed-in data type (GH-22263) (GH-22266)

2020-09-15T23:59:48+00:00

(cherry picked from commit bff01f3a3aac0c15fe8fbe8b2f561f7927d117a1)

bpo-41780: Fix dir of types.GenericAlias (GH-22262)

2020-09-15T23:37:13+00:00

Automerge-Triggered-By: @gvanrossum
(cherry picked from commit 2e87774df1a0eaf2a1fe8cc4d958df60f7125b6e)

Co-authored-by: Batuhan Taskaya

Improve the description of difflib in the documentation (GH-22253) (#22261)

2020-09-15T19:45:05+00:00

From "can produce difference information in various formats ..."
to " can produce information about file differences in various formats ..."

Automerge-Triggered-By: @Mariatta
(cherry picked from commit 5531269f698f789d1247123fd82681f7a455f66e)

Co-authored-by: Mandeep

[3.9] bpo-41631: _ast module uses again a global state (GH-21961) (GH-22258)

2020-09-15T18:32:56+00:00

Partially revert commit ac46eb4ad6662cf6d771b20d8963658b2186c48c:
"bpo-38113: Update the Python-ast.c generator to PEP384 (gh-15957)".

Using a module state per module instance is causing subtle practical
problems.

For example, the Mercurial project replaces the __import__() function
to implement lazy import, whereas Python expected that "import _ast"
always return a fully initialized _ast module.

Add _PyAST_Fini() to clear the state at exit.

The _ast module has no state (set _astmodule.m_size to 0). Remove
astmodule_traverse(), astmodule_clear() and astmodule_free()
functions..
(cherry picked from commit e5fbe0cbd4be99ced5f000ad382208ad2a561c90)

Co-authored-by: Victor Stinner

bpo-41776: Revise example of "continue" in the tutorial documentation (GH-22234) (GH-22255)

2020-09-15T13:56:28+00:00

Revise example of "continue" in the tutorial documentation
(cherry picked from commit 7bcc6456ad4704da9b287c8045768fa53961adc5)

Co-authored-by: Neeraj Samtani 

Co-authored-by: Neeraj Samtani