python / cpython

…6552)

Motivation for this PR (comment from @vstinner in bpo issue):
```
Warning seen o AMD64 Ubuntu Shared 3.x buildbot:
https://buildbot.python.org/all/#/builders/141/builds/2593

test_devnull_output (test.test_a=syncio.test_subprocess.SubprocessThreadedWatcherTests) ...
Warning -- threading_cleanup() failed to cleanup 1 threads (count: 1, dangling: 2)
```
The following implementation details for the new method are TBD:

1) Public vs private

2) Inclusion in `close()`

3) Name

4) Coroutine vs subroutine method

5) *timeout* parameter

If it's a private method, 3, 4, and 5 are significantly less important.

I started with the most minimal implementation that fixes the dangling threads without modifying the regression tests, which I think is particularly important. I typically try to avoid directly modifying existing tests as much as possible unless it's necessary to do so. However, I am open to changing any part of this.


https://bugs.python.org/issue38356

…-17934)

…-17960)

Although the underlying libffi issue remains open, adding these
checks have caused problems in third-party projects which are in
widespread use. See the issue for examples.

The corresponding tests have also been skipped.

Return the next floating-point value after x towards y.

nntplib.NNTP and nntplib.NNTP_SSL now raise a ValueError
if the given timeout for their constructor is zero to
prevent the creation of a non-blocking socket.

* bpo-39297: Update for importlib_metadata 1.4. Includes performance updates.

* 📜🤖 Added by blurb_it.

* Update blurb

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>

Host as None in address raises TypeError since it should be string, bytes or bytearray.

…-17814)

Correct the error message when calling the min() or max() with
no arguments.

poplib.POP3 and poplib.POP3_SSL now raise a ValueError
if the given timeout for their constructor is zero to
prevent the creation of a non-blocking socket.

The fix changes copy_location() to require an extra node from which to extract the end location, and fixing all 5 call sites.


https://bugs.python.org/issue39235

* Fix typo in test's docstring. contination -> continuation.

* Add test cases for dataclasses.

* Add test for repr output of field.
* Add test for ValueError to be raised when both default and default_factory are passed.

GH-17896)

\+ this also adds a stronger warning against sharing objects between (sub-)interpreters.



https://bugs.python.org/issue39161

GH-17914)

…ocations_impl (GH-17916)

…ion_bind. (GH-17908)

Filename and line numbers are not needed when Py_REF_DEBUG are not
defined.

The static inline _Py_DECREF() function was introduced by
commit 2aaf0c1.

…H-17822)

https://bugs.python.org/issue39233

…H-17877)

GH-17780)

Correctly parenthesize filter-based statements that contain lambda
expressions in lib2to3.

…H-17203)

imaplib.IMAP4 and imaplib.IMAP4_SSL now have an 
optional *timeout* parameter for their constructors.
Also, the imaplib.IMAP4.open() method now has an optional *timeout* parameter
with this change. The overridden methods of imaplib.IMAP4_SSL and
imaplib.IMAP4_stream were applied to this change.

…nabledFor (GH-17689)

The select.epoll.unregister() method no longer ignores the EBADF
error.

https://bugs.python.org/issue39191