python / cpython

The `for` statement doesn't use a condition and this function, the `while` statement does.

…20434)

The hard part was making all the tests pass; there are some subtle issues here, because apparently the future import wasn't tested very thoroughly in previous Python versions.

For example, `inspect.signature()` returned type objects normally (except for forward references), but strings with the future import. We changed it to try and return type objects by calling `typing.get_type_hints()`, but fall back on returning strings if that function fails (which it may do if there are future references in the annotations that require passing in a specific namespace to resolve).

This function recomputes `cls.__abstractmethods__`.
Also update `@dataclass` to use it.

…UnicodeNames tests (GH-22575)

Similarly to GH-22566, those tests called eval() on content received via
HTTP in test_named_sequences_full. This likely isn't exploitable because
unicodedata.lookup(seqname) is called before self.checkletter(seqname,
None) - thus any string which isn't a valid unicode character name
wouldn't ever reach the checkletter method.

Still, it's probably better to be safe than sorry.

…CJK codec tests (GH-22566)

…perator is called (#22505)

Call urllib.request.urlcleanup() to reset the global
urllib.request._opener.

Remove mention of space in "remove multiple items from list".

…H-22552)

https://sqlite.org/releaselog/3_33_0.html

… avoids modifying an XML tree while iterating over it. (GH-22464)

Enable recursion checks which were disabled when get __bases__ of
non-type objects in issubclass() and isinstance() and when intern
strings. It fixes a stack overflow when getting __bases__ leads
to infinite recursion.

Originally recursion checks was disabled for PyDict_GetItem() which
silences all errors including the one raised in case of detected
recursion and can return incorrect result. But now the code uses
PyDict_GetItemWithError() and PyDict_SetDefault() instead.

Multiple typo fixes in code comments

Automerge-Triggered-By: @Mariatta

…s doc (GH-22526)

Also document that eval() does this (the same way).

…H-22524)

This changes a few occurrences left behind by #22340.

Automerge-Triggered-By: @gvanrossum

…e symtable module (GH-22391)

Missed this occurrence before, sorry. Also changed "the PEP" to "PEP".

Automerge-Triggered-By: @gvanrossum

bpo-40564: Avoid copying state from extant ZipFile.

Co-authored-by: Skip Montanaro

…ds (GH-22418)

…H-20554)

…en a default namespace was defined. (GH-22474)

Automerge-Triggered-By: @gvanrossum

* Correct at 2 places in email module

The PyUnicode_InternImmortal() function is now deprecated and will be
removed in Python 3.12: use PyUnicode_InternInPlace() instead.