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GH-109190: Copyedit 3.12 What's New: Other Language Changes (#109660)

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Adam Turner 2023-09-22 14:05:39 +01:00 • committed by GitHub
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@ -459,12 +459,12 @@ and others in :gh:`103764`.)
Other Language Changes Other Language Changes
====================== ======================
* Add :ref:`perf_profiling` through the new * Add :ref:`support for the perf profiler <perf_profiling>` through the new
environment variable :envvar:`PYTHONPERFSUPPORT`, environment variable :envvar:`PYTHONPERFSUPPORT`
the new command-line option :option:`-X perf <-X>`, and command-line option :option:`-X perf <-X>`,
as well as the new :func:`sys.activate_stack_trampoline`, as well as the new :func:`sys.activate_stack_trampoline`,
:func:`sys.deactivate_stack_trampoline`, :func:`sys.deactivate_stack_trampoline`,
and :func:`sys.is_stack_trampoline_active` APIs. and :func:`sys.is_stack_trampoline_active` functions.
(Design by Pablo Galindo. Contributed by Pablo Galindo and Christian Heimes (Design by Pablo Galindo. Contributed by Pablo Galindo and Christian Heimes
with contributions from Gregory P. Smith [Google] and Mark Shannon with contributions from Gregory P. Smith [Google] and Mark Shannon
in :gh:`96123`.) in :gh:`96123`.)
@ -473,7 +473,7 @@ Other Language Changes
have a new a *filter* argument that allows limiting tar features than may be have a new a *filter* argument that allows limiting tar features than may be
surprising or dangerous, such as creating files outside the destination surprising or dangerous, such as creating files outside the destination
directory. directory.
See :ref:`tarfile-extraction-filter` for details. See :ref:`tarfile extraction filters <tarfile-extraction-filter>` for details.
In Python 3.14, the default will switch to ``'data'``. In Python 3.14, the default will switch to ``'data'``.
(Contributed by Petr Viktorin in :pep:`706`.) (Contributed by Petr Viktorin in :pep:`706`.)
@ -501,8 +501,8 @@ Other Language Changes
* A backslash-character pair that is not a valid escape sequence now generates * A backslash-character pair that is not a valid escape sequence now generates
a :exc:`SyntaxWarning`, instead of :exc:`DeprecationWarning`. a :exc:`SyntaxWarning`, instead of :exc:`DeprecationWarning`.
For example, ``re.compile("\d+\.\d+")`` now emits a :exc:`SyntaxWarning` For example, ``re.compile("\d+\.\d+")`` now emits a :exc:`SyntaxWarning`
(``"\d"`` is an invalid escape sequence), use raw strings for regular (``"\d"`` is an invalid escape sequence, use raw strings for regular
expression: ``re.compile(r"\d+\.\d+")``. expression: ``re.compile(r"\d+\.\d+")``).
In a future Python version, :exc:`SyntaxError` will eventually be raised, In a future Python version, :exc:`SyntaxError` will eventually be raised,
instead of :exc:`SyntaxWarning`. instead of :exc:`SyntaxWarning`.
(Contributed by Victor Stinner in :gh:`98401`.) (Contributed by Victor Stinner in :gh:`98401`.)
@ -531,7 +531,7 @@ Other Language Changes
when summing floats or mixed ints and floats. when summing floats or mixed ints and floats.
(Contributed by Raymond Hettinger in :gh:`100425`.) (Contributed by Raymond Hettinger in :gh:`100425`.)
* Exceptions raised in a typeobject's ``__set_name__`` method are no longer * 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 wrapped by a :exc:`RuntimeError`. Context information is added to the
exception as a :pep:`678` note. (Contributed by Irit Katriel in :gh:`77757`.) exception as a :pep:`678` note. (Contributed by Irit Katriel in :gh:`77757`.)