mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-08-03 08:34:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 6

GH-109190: Copyedit 3.12 What's New: Sort Other Language Changes (#109836)

Browse source
This commit is contained in:
Adam Turner 2023-09-25 15:42:03 +01:00 • committed by GitHub
parent 72fb39c965
commit 86e7c611ac
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 47 additions and 47 deletions
Download patch file Download diff file Expand all files Collapse all files

94
Doc/whatsnew/3.12.rst
View file

@ -465,45 +465,9 @@ and others in :gh:`103764`.)
Other Language Changes
======================
* Add :ref:`support for the perf profiler <perf_profiling>` through the new
environment variable :envvar:`PYTHONPERFSUPPORT`
and command-line option :option:`-X perf <-X>`,
as well as the new :func:`sys.activate_stack_trampoline`,
:func:`sys.deactivate_stack_trampoline`,
and :func:`sys.is_stack_trampoline_active` functions.
(Design by Pablo Galindo. Contributed by Pablo Galindo and Christian Heimes
with contributions from Gregory P. Smith [Google] and Mark Shannon
in :gh:`96123`.)
* The extraction methods in :mod:`tarfile`, and :func:`shutil.unpack_archive`,
have a new a *filter* argument that allows limiting tar features than may be
surprising or dangerous, such as creating files outside the destination
directory.
See :ref:`tarfile extraction filters <tarfile-extraction-filter>` for details.
In Python 3.14, the default will switch to ``'data'``.
(Contributed by Petr Viktorin in :pep:`706`.)
* :class:`types.MappingProxyType` instances are now hashable if the underlying
mapping is hashable.
(Contributed by Serhiy Storchaka in :gh:`87995`.)
* :class:`memoryview` now supports the half-float type (the "e" format code).
(Contributed by Donghee Na and Antoine Pitrou in :gh:`90751`.)
* The parser now raises :exc:`SyntaxError` when parsing source code containing
null bytes. (Contributed by Pablo Galindo in :gh:`96670`.)
* :func:`ast.parse` now raises :exc:`SyntaxError` instead of :exc:`ValueError`
when parsing source code containing null bytes. (Contributed by Pablo Galindo
in :gh:`96670`.)
* The Garbage Collector now runs only on the eval breaker mechanism of the
Python bytecode evaluation loop instead of object allocations. The GC can
also run when :c:func:`PyErr_CheckSignals` is called so C extensions that
need to run for a long time without executing any Python code also have a
chance to execute the GC periodically. (Contributed by Pablo Galindo in
:gh:`97922`.)
* A backslash-character pair that is not a valid escape sequence now generates
a :exc:`SyntaxWarning`, instead of :exc:`DeprecationWarning`.
For example, ``re.compile("\d+\.\d+")`` now emits a :exc:`SyntaxWarning`
@ -519,10 +483,6 @@ Other Language Changes
In a future Python version they will be eventually a :exc:`SyntaxError`.
(Contributed by Victor Stinner in :gh:`98401`.)
* All builtin and extension callables expecting boolean parameters now accept
arguments of any type instead of just :class:`bool` and :class:`int`.
(Contributed by Serhiy Storchaka in :gh:`60203`.)
* Variables used in the target part of comprehensions that are not stored to
can now be used in assignment expressions (``:=``).
For example, in ``[(b := 1) for a, b.prop in some_iter]``, the assignment to
@ -530,13 +490,6 @@ Other Language Changes
part of comprehensions (like ``a``) is still disallowed, as per :pep:`572`.
(Contributed by Nikita Sobolev in :gh:`100581`.)
* :class:`slice` objects are now hashable, allowing them to be used as dict keys and
set items. (Contributed by Will Bradshaw, Furkan Onder, and Raymond Hettinger in :gh:`101264`.)
* :func:`sum` now uses Neumaier summation to improve accuracy and commutativity
when summing floats or mixed ints and floats.
(Contributed by Raymond Hettinger in :gh:`100425`.)
* Exceptions raised in a class or type's ``__set_name__`` method are no longer
wrapped by a :exc:`RuntimeError`. Context information is added to the
exception as a :pep:`678` note. (Contributed by Irit Katriel in :gh:`77757`.)
@ -546,6 +499,53 @@ Other Language Changes
:exc:`ExceptionGroup`. Also changed in version 3.11.4. (Contributed by Irit
Katriel in :gh:`103590`.)
* The Garbage Collector now runs only on the eval breaker mechanism of the
Python bytecode evaluation loop instead of object allocations. The GC can
also run when :c:func:`PyErr_CheckSignals` is called so C extensions that
need to run for a long time without executing any Python code also have a
chance to execute the GC periodically. (Contributed by Pablo Galindo in
:gh:`97922`.)
* All builtin and extension callables expecting boolean parameters now accept
arguments of any type instead of just :class:`bool` and :class:`int`.
(Contributed by Serhiy Storchaka in :gh:`60203`.)
* :class:`memoryview` now supports the half-float type (the "e" format code).
(Contributed by Donghee Na and Antoine Pitrou in :gh:`90751`.)
* :class:`slice` objects are now hashable, allowing them to be used as dict keys and
set items. (Contributed by Will Bradshaw, Furkan Onder, and Raymond Hettinger in :gh:`101264`.)
* :func:`sum` now uses Neumaier summation to improve accuracy and commutativity
when summing floats or mixed ints and floats.
(Contributed by Raymond Hettinger in :gh:`100425`.)
* :func:`ast.parse` now raises :exc:`SyntaxError` instead of :exc:`ValueError`
when parsing source code containing null bytes. (Contributed by Pablo Galindo
in :gh:`96670`.)
* The extraction methods in :mod:`tarfile`, and :func:`shutil.unpack_archive`,
have a new a *filter* argument that allows limiting tar features than may be
surprising or dangerous, such as creating files outside the destination
directory.
See :ref:`tarfile extraction filters <tarfile-extraction-filter>` for details.
In Python 3.14, the default will switch to ``'data'``.
(Contributed by Petr Viktorin in :pep:`706`.)
* :class:`types.MappingProxyType` instances are now hashable if the underlying
mapping is hashable.
(Contributed by Serhiy Storchaka in :gh:`87995`.)
* Add :ref:`support for the perf profiler <perf_profiling>` through the new
environment variable :envvar:`PYTHONPERFSUPPORT`
and command-line option :option:`-X perf <-X>`,
as well as the new :func:`sys.activate_stack_trampoline`,
:func:`sys.deactivate_stack_trampoline`,
and :func:`sys.is_stack_trampoline_active` functions.
(Design by Pablo Galindo. Contributed by Pablo Galindo and Christian Heimes
with contributions from Gregory P. Smith [Google] and Mark Shannon
in :gh:`96123`.)
New Modules
===========