- Update to 3.12.7:
- Tests
- gh-124378: Updated test_ttk to pass with Tcl/Tk 8.6.15.
- Security
- gh-122792: Changed IPv4-mapped ipaddress.IPv6Address to
consistently use the mapped IPv4 address value for deciding
properties. Properties which have their behavior fixed are
is_multicast, is_reserved, is_link_local, is_global, and
is_unspecified.
- Library
- gh-116850: Fix argparse for namespaces with not directly
writable dict (e.g. classes).
- gh-58573: Fix conflicts between abbreviated long options in
the parent parser and subparsers in argparse.
- gh-61181: Fix support of choices with string value in
argparse. Substrings of the specified string no longer
considered valid values.
- gh-80259: Fix argparse support of positional arguments with
nargs='?', default=argparse.SUPPRESS and specified type.
- gh-124498: Fix typing.TypeAliasType not to be generic, when
type_params is an empty tuple.
- gh-124345: argparse vim supports abbreviated single-dash
long options separated by = from its value.
- gh-104860: Fix disallowing abbreviation of single-dash long
options in argparse with allow_abbrev=False.
- gh-63143: Fix parsing mutually exclusive arguments in
argparse. Arguments with the value identical to the default
value (e.g. booleans, small integers, empty or 1-character
strings) are no longer considered “not present”.
- gh-72795: Positional arguments with nargs equal to '*' or
argparse.REMAINDER are no longer required. This allows to
use positional argument with nargs='*' and without default
in mutually exclusive group and improves error message
about required arguments.
- gh-59317: Fix parsing positional argument with nargs equal
to '?' or '*' if it is preceded by an option and another
positional argument.
- gh-53780: argparse now ignores the first "--" (double dash)
between an option and command.
- gh-124217: Add RFC 9637 reserved IPv6 block 3fff::/20 in
ipaddress module.
- gh-124248: Fixed potential crash when using struct to
process zero-width ‘Pascal string’ fields (0p).
- gh-81691: Fix handling of multiple "--" (double dashes)
in argparse. Only the first one has now been removed, all
subsequent ones are now taken literally.
- gh-87041: Fix a bug in argparse where lengthy subparser
argument help is incorrectly indented.
- gh-124171: Add workaround for broken fmod() implementations
on Windows, that loose zero sign (e.g. fmod(-10, 1) returns
0.0). Patch by Sergey B Kirpichev.
- gh-123934: Fix unittest.mock.MagicMock reseting magic
methods return values after .reset_mock(return_value=True)
was called.
- gh-123935: Fix parent slots detection for dataclasses that
inherit from classes with __dictoffset__.
- gh-123892: Add "_wmi" to sys.stdlib_module_names. Patch by
Victor Stinner.
- gh-116810: Resolve a memory leak introduced in CPython
3.10’s ssl when the ssl.SSLSocket.session property was
accessed. Speeds up read and write access to said property
by no longer unnecessarily cloning session objects via
serialization.
- gh-121735: When working with zip archives,
importlib.resources now properly honors module-adjacent
references (e.g. files(pkg.mod) and not just files(pkg)).
- gh-119004: Fix a crash in OrderedDict.__eq__ when operands
are mutated during the check. Patch by Bénédikt Tran.
- bpo-44864: Do not translate user-provided strings in
argparse.ArgumentParser.
- IDLE
- gh-112938: Fix uninteruptable hang when Shell gets rapid
continuous output.
- Core and Builtins
- gh-116510: Fix a bug that can cause a crash when
sub-interpreters use “basic” single-phase extension
modules. Shared objects could refer to PyGC_Head nodes that
had been freed as part of interpreter cleanup.
- gh-124188: Fix reading and decoding a line from the source
file witn non-UTF-8 encoding for syntax errors raised in
the compiler.
- gh-77894: Fix possible crash in the garbage collector when
it tries to break a reference loop containing a memoryview
object. Now a memoryview object can only be cleared if
there are no buffers that refer it.
- gh-98442: Fix too wide source locations of the cleanup
instructions of a with statement.
- gh-113993: Strings interned with sys.intern() are again
garbage-collected when no longer used, as per the
documentation. Strings interned with the C function
PyUnicode_InternInPlace() are still immortal. Internals of
the string interning mechanism have been changed. This may
affect performance and identities of str objects.
- C API
- gh-113993: PyUnicode_InternInPlace() no longer prevents its
argument from being garbage collected.
- Several functions that take char * are now documented
as possibly preventing string objects from being
garbage collected; refer to their documentation
for details: PyUnicode_InternFromString(),
PyDict_SetItemString(), PyObject_SetAttrString(),
PyObject_DelAttrString(), PyUnicode_InternFromString(), and
PyModule_Add* convenience functions.
- Build
- gh-124487: Windows builds now use Windows 8.1 as their API
baseline (installation already required Windows 8.1).
- gh-123917: Fix the check for the crypt() function in the
configure script. Patch by Paul Smith and Victor Stinner.
- Change previous removal of *.pyc files with rm -f instead of ||/bin/true