bpo-25130: Make unit-test about restricting the maximum number of nested blocks cpython-only (GH-28002)
PyPy and potentially other implementations have different or no
contraints on the number of blocks that can be statically nested. move
the test that checks for this behaviour into a unit test and mark it as
CPython-only.
Thomas Grainger [Sat, 28 Aug 2021 17:07:37 +0000 (18:07 +0100)]
bpo-44962: Fix a race in WeakKeyDict, WeakValueDict and WeakSet when two threads attempt to commit the last pending removal (GH-27921)
Fixes:
Traceback (most recent call last):
File "/home/graingert/projects/asyncio-demo/demo.py", line 36, in <module>
sys.exit(main())
File "/home/graingert/projects/asyncio-demo/demo.py", line 30, in main
test_all_tasks_threading()
File "/home/graingert/projects/asyncio-demo/demo.py", line 24, in test_all_tasks_threading
results.append(f.result())
File "/usr/lib/python3.10/concurrent/futures/_base.py", line 438, in result
return self.__get_result()
File "/usr/lib/python3.10/concurrent/futures/_base.py", line 390, in __get_result
raise self._exception
File "/usr/lib/python3.10/concurrent/futures/thread.py", line 52, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/lib/python3.10/asyncio/runners.py", line 47, in run
_cancel_all_tasks(loop)
File "/usr/lib/python3.10/asyncio/runners.py", line 56, in _cancel_all_tasks
to_cancel = tasks.all_tasks(loop)
File "/usr/lib/python3.10/asyncio/tasks.py", line 53, in all_tasks
tasks = list(_all_tasks)
File "/usr/lib/python3.10/_weakrefset.py", line 60, in __iter__
with _IterationGuard(self):
File "/usr/lib/python3.10/_weakrefset.py", line 33, in __exit__
w._commit_removals()
File "/usr/lib/python3.10/_weakrefset.py", line 57, in _commit_removals
discard(l.pop())
IndexError: pop from empty list
Also fixes:
Exception ignored in: weakref callback <function WeakKeyDictionary.__init__.<locals>.remove at 0x00007fe82245d2e0>
Traceback (most recent call last):
File "/usr/lib/pypy3/lib-python/3/weakref.py", line 390, in remove
del self.data[k]
KeyError: <weakref at 0x00007fe76e8d8180; dead>
Exception ignored in: weakref callback <function WeakKeyDictionary.__init__.<locals>.remove at 0x00007fe82245d2e0>
Traceback (most recent call last):
File "/usr/lib/pypy3/lib-python/3/weakref.py", line 390, in remove
del self.data[k]
KeyError: <weakref at 0x00007fe76e8d81a0; dead>
Exception ignored in: weakref callback <function WeakKeyDictionary.__init__.<locals>.remove at 0x00007fe82245d2e0>
Traceback (most recent call last):
File "/usr/lib/pypy3/lib-python/3/weakref.py", line 390, in remove
del self.data[k]
KeyError: <weakref at 0x000056548f1e24a0; dead>
See: https://github.com/agronholm/anyio/issues/362#issuecomment-904424310
See also: https://bugs.python.org/issue29519
* Add termios.tcgetwinsize(), termios.tcsetwinsize(). Update docs.
* Add TIOCGSIZE support to termios.tcgetwinsize()
* Add TIOCSSIZE support to termios.tcsetwinsize()
Authored-by: Soumendra Ganguly <soumendraganguly@gmail.com>
* termios.tcgetwinsize() and termios.tcsetwinsize() should return/accept two-item tuples instead of lists.
* Refactor tcsetwinsize to share common code and accept any two item sequence, with overflow checking.
Co-authored-by: Gregory P. Smith <greg@krypto.org> [Google]
bpo-45001: Make email date parsing more robust against malformed input (GH-27946)
Various date parsing utilities in the email module, such as
email.utils.parsedate(), are supposed to gracefully handle invalid
input, typically by raising an appropriate exception or by returning
None.
The internal email._parseaddr._parsedate_tz() helper used by some of
these date parsing routines tries to be robust against malformed input,
but unfortunately it can still crash ungracefully when a non-empty but
whitespace-only input is passed. This manifests as an unexpected
IndexError.
In practice, this can happen when parsing an email with only a newline
inside a ‘Date:’ header, which unfortunately happens occasionally in the
real world.
Here's a minimal example:
$ python
Python 3.9.6 (default, Jun 30 2021, 10:22:16)
[GCC 11.1.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import email.utils
>>> email.utils.parsedate('foo')
>>> email.utils.parsedate(' ')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.9/email/_parseaddr.py", line 176, in parsedate
t = parsedate_tz(data)
File "/usr/lib/python3.9/email/_parseaddr.py", line 50, in parsedate_tz
res = _parsedate_tz(data)
File "/usr/lib/python3.9/email/_parseaddr.py", line 72, in _parsedate_tz
if data[0].endswith(',') or data[0].lower() in _daynames:
IndexError: list index out of range
The fix is rather straight-forward: guard against empty lists, after
splitting on whitespace, but before accessing the first element.
Mark Shannon [Wed, 25 Aug 2021 12:44:20 +0000 (13:44 +0100)]
bpo-44990: Change layout of evaluation frames. "Layout B" (GH-27933)
Places the locals between the specials and stack. This is the more "natural" layout for a C struct, makes the code simpler and gives a slight speedup (~1%)
Jack DeVries [Tue, 24 Aug 2021 17:01:41 +0000 (13:01 -0400)]
bpo-39452: Rewrite and expand __main__.rst (#26883)
Broadened scope of the document to explicitly discuss and differentiate between ``__main__.py`` in packages versus the ``__name__ == '__main__'`` expression (and the idioms that surround it), as well as ``import __main__``.
Idan Moral [Mon, 23 Aug 2021 23:44:28 +0000 (02:44 +0300)]
bpo-44690: Adopt binacii.a2b_base64's strict mode in base64.b64decode (GH-27272)
* Use binascii.a2b_base64 to validate b64decode input.
This change leads to exception messages changes (mostly).
* Added more information to docstring of b64decode
* Added a reference to binascii.a2b_base64 in the docs
Sebastian Rittau [Sun, 22 Aug 2021 18:45:01 +0000 (20:45 +0200)]
bpo-44957: Promote PEP 604 syntax in typing docs (GH-27833)
* Use "X | Y" instead of "Union" where it makes sense.
* Mention that "X | Y" is equivalent to "Union[X, Y]" in Union section.
* Remove "Optional[X]" as shorthand for "Union[X, None]" as the new
shorthand is now "X | None".
* Mention that "Optional[X]" can be written as "X | None" in section
about "Optional".
Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
Mark Roseman [Sun, 22 Aug 2021 18:41:45 +0000 (11:41 -0700)]
bpo-42560: reorganize Tkinter docs modules section for clarity (GH-27840)
- move description of internal modules (_tkinter and tkinter.constants) from section intro to list of additional modules at end of section, as not most important info
- added missing ttk and tix here
- emphasized up front that most apps will need tkinter and ttk
Mark Roseman [Sun, 22 Aug 2021 18:34:15 +0000 (11:34 -0700)]
bpo-42560: rework external references in Tkinter docs (GH-27838)
- reorganized from two sections (tkinter vs. tcl/tk) into three (tkinter, tcl/tk, and books)
- main (recommended) tkinter docs have one tutorial (tkdocs) and one reference (shipman), added better descriptions
- dropped link to Tkinter page on wiki (suggestion by E. Paine; outdated, most material already linked to from python.org)
- replaced Tcl/Tk recent man pages and core dev home with single link to main Tcl/Tk page (which holds both of these)
- updated Modern Tkinter link to book page on TkDocs site (was Amazon link to old version), dropped description
- replaced Grayson book by Moore book (newer, covers ttk)
- changed Ousterhout ref to second edition, covers ttk
- dropped link to Welch book (old)
Serhiy Storchaka [Sun, 22 Aug 2021 07:33:52 +0000 (10:33 +0300)]
bpo-44955: Always call stopTestRun() for implicitly created TestResult objects (GH-27831)
Method stopTestRun() is now always called in pair with method startTestRun()
for TestResult objects implicitly created in TestCase.run().
Previously it was not called for test methods and classes decorated with
a skipping decorator.
Guido van Rossum [Mon, 16 Aug 2021 18:34:23 +0000 (11:34 -0700)]
Fix a SystemError in code.replace() (#27771)
While the comment said 'We don't bother resizing localspluskinds',
this would cause .replace() to crash when it happened.
(Also types.CodeType(), but testing that is tedious, and this tests all
code paths.)