mirror of https://github.com/python/cpython
gh-109975: Copyedit "What's New in Python 3.13" (#117902)
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
This commit is contained in:
Hugo van Kemenade
GitHub
parent
520cf2170e
commit
78da154067
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@ -82,7 +82,7 @@ Important deprecations, removals or restrictions:
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Interpreter improvements:
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* A basic :ref:`JIT compiler <whatsnew313-jit-compiler>` was added.
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* :pep:`744`: A basic :ref:`JIT compiler <whatsnew313-jit-compiler>` was added.
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It is currently disabled by default (though we may turn it on later).
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Performance improvements are modest -- we expect to be improving this
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over the next few releases.
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@ -212,9 +212,8 @@ Other Language Changes
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(Contributed by William Woodruff in :gh:`112389`.)
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* The :class:`configparser.ConfigParser` now accepts unnamed sections before named
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ones if configured to do so.
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(Contributed by Pedro Sousa Lacerda in :gh:`66449`)
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ones if configured to do so.
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(Contributed by Pedro Sousa Lacerda in :gh:`66449`.)
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New Modules
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@ -233,7 +232,7 @@ argparse
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:meth:`~argparse.ArgumentParser.add_argument` and :meth:`!add_parser`
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which allows to deprecate command-line options, positional arguments and
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subcommands.
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(Contributed by Serhiy Storchaka in :gh:`83648`).
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(Contributed by Serhiy Storchaka in :gh:`83648`.)
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array
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-----
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@ -263,9 +262,9 @@ ast
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argument that does not map to a field on the AST node is now deprecated,
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and will raise an exception in Python 3.15.
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* :func:`ast.parse` now accepts an optional argument ``optimize``
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* :func:`ast.parse` now accepts an optional argument *optimize*
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which is passed on to the :func:`compile` built-in. This makes it
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possible to obtain an optimized ``AST``.
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possible to obtain an optimized AST.
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(Contributed by Irit Katriel in :gh:`108113`.)
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asyncio
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@ -332,7 +331,7 @@ base64
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------
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* Add :func:`base64.z85encode` and :func:`base64.z85decode` functions which allow encoding
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and decoding z85 data.
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and decoding Z85 data.
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See `Z85 specification <https://rfc.zeromq.org/spec/32/>`_ for more information.
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(Contributed by Matan Perelman in :gh:`75299`.)
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@ -355,6 +354,9 @@ dbm
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from the database.
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(Contributed by Donghee Na in :gh:`107122`.)
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* Add new :mod:`dbm.sqlite3` backend, and make it the default :mod:`!dbm` backend.
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(Contributed by Raymond Hettinger and Erlend E. Aasland in :gh:`100414`.)
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dis
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---
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@ -364,16 +366,6 @@ dis
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the ``show_offsets`` parameter.
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(Contributed by Irit Katriel in :gh:`112137`.)
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dbm
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---
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* Add :meth:`dbm.gnu.gdbm.clear` and :meth:`dbm.ndbm.ndbm.clear` methods that remove all items
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from the database.
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(Contributed by Donghee Na in :gh:`107122`.)
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* Add new :mod:`dbm.sqlite3` backend, and make it the default :mod:`!dbm` backend.
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(Contributed by Raymond Hettinger and Erlend E. Aasland in :gh:`100414`.)
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doctest
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-------
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@ -390,7 +382,7 @@ email
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encountered instead of potentially inaccurate values. Add optional *strict*
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parameter to these two functions: use ``strict=False`` to get the old
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behavior, accept malformed inputs.
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``getattr(email.utils, 'supports_strict_parsing', False)`` can be use to
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``getattr(email.utils, 'supports_strict_parsing', False)`` can be used to
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check if the *strict* parameter is available.
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(Contributed by Thomas Dwyer and Victor Stinner for :gh:`102988` to improve
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the CVE-2023-27043 fix.)
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@ -409,21 +401,22 @@ gc
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* The cyclic garbage collector is now incremental, which changes the meanings
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of the results of :meth:`gc.get_threshold` and :meth:`gc.set_threshold` as
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well as :meth:`gc.get_count` and :meth:`gc.get_stats`.
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* :meth:`gc.get_threshold` returns a three-tuple for backwards compatibility,
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the first value is the threshold for young collections, as before, the second
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value determines the rate at which the old collection is scanned; the
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default is 10 and higher values mean that the old collection is scanned more slowly.
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The third value is meangless and is always zero.
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* :meth:`gc.set_threshold` ignores any items after the second.
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* :meth:`gc.get_count` and :meth:`gc.get_stats`.
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These functions return the same format of results as before.
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The only difference is that instead of the results refering to
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the young, aging and old generations, the results refer to the
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young generation and the aging and collecting spaces of the old generation.
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In summary, code that attempted to manipulate the behavior of the cycle GC may
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not work exactly as intended, but it is very unlikely to harmful.
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All other code will work just fine.
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* :meth:`gc.get_threshold` returns a three-item tuple for backwards compatibility.
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The first value is the threshold for young collections, as before; the second
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value determines the rate at which the old collection is scanned (the
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default is 10, and higher values mean that the old collection is scanned more slowly).
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The third value is meaningless and is always zero.
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* :meth:`gc.set_threshold` ignores any items after the second.
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* :meth:`gc.get_count` and :meth:`gc.get_stats`
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return the same format of results as before.
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The only difference is that instead of the results referring to
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the young, aging and old generations, the results refer to the
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young generation and the aging and collecting spaces of the old generation.
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In summary, code that attempted to manipulate the behavior of the cycle GC may
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not work exactly as intended, but it is very unlikely to be harmful.
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All other code will work just fine.
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glob
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----
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@ -432,46 +425,49 @@ glob
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shell-style wildcards to a regular expression.
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(Contributed by Barney Gale in :gh:`72904`.)
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io
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--
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The :class:`io.IOBase` finalizer now logs the ``close()`` method errors with
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:data:`sys.unraisablehook`. Previously, errors were ignored silently by default,
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and only logged in :ref:`Python Development Mode <devmode>` or on :ref:`Python
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built on debug mode <debug-build>`.
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(Contributed by Victor Stinner in :gh:`62948`.)
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importlib
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---------
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Previously deprecated :mod:`importlib.resources` functions are un-deprecated:
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* Previously deprecated :mod:`importlib.resources` functions are un-deprecated:
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* :func:`~importlib.resources.is_resource()`
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* :func:`~importlib.resources.open_binary()`
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* :func:`~importlib.resources.open_text()`
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* :func:`~importlib.resources.path()`
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* :func:`~importlib.resources.read_binary()`
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* :func:`~importlib.resources.read_text()`
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* :func:`~importlib.resources.is_resource()`
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* :func:`~importlib.resources.open_binary()`
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* :func:`~importlib.resources.open_text()`
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* :func:`~importlib.resources.path()`
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* :func:`~importlib.resources.read_binary()`
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* :func:`~importlib.resources.read_text()`
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All now allow for a directory (or tree) of resources, using multiple positional
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arguments.
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All now allow for a directory (or tree) of resources, using multiple positional
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arguments.
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For text-reading functions, the *encoding* and *errors* must now be given as
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keyword arguments.
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For text-reading functions, the *encoding* and *errors* must now be given as
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keyword arguments.
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The :func:`~importlib.resources.contents()` remains deprecated in favor of
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the full-featured :class:`~importlib.resources.abc.Traversable` API.
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However, there is now no plan to remove it.
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The :func:`~importlib.resources.contents()` remains deprecated in favor of
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the full-featured :class:`~importlib.resources.abc.Traversable` API.
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However, there is now no plan to remove it.
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(Contributed by Petr Viktorin in :gh:`106532`.)
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(Contributed by Petr Viktorin in :gh:`106532`.)
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io
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--
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* The :class:`io.IOBase` finalizer now logs the ``close()`` method errors with
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:data:`sys.unraisablehook`. Previously, errors were ignored silently by default,
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and only logged in :ref:`Python Development Mode <devmode>` or on :ref:`Python
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built on debug mode <debug-build>`.
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(Contributed by Victor Stinner in :gh:`62948`.)
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ipaddress
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---------
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* Add the :attr:`ipaddress.IPv4Address.ipv6_mapped` property, which returns the IPv4-mapped IPv6 address.
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(Contributed by Charles Machalow in :gh:`109466`.)
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* Fix ``is_global`` and ``is_private`` behavior in ``IPv4Address``, ``IPv6Address``, ``IPv4Network``
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and ``IPv6Network``.
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* Fix ``is_global`` and ``is_private`` behavior in
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:class:`~ipaddress.IPv4Address`,
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:class:`~ipaddress.IPv6Address`,
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:class:`~ipaddress.IPv4Network` and
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:class:`~ipaddress.IPv6Network`.
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itertools
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---------
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@ -492,12 +488,12 @@ marshal
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math
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----
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A new function :func:`~math.fma` for fused multiply-add operations has been
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added. This function computes ``x * y + z`` with only a single round, and so
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avoids any intermediate loss of precision. It wraps the ``fma()`` function
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provided by C99, and follows the specification of the IEEE 754
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"fusedMultiplyAdd" operation for special cases.
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(Contributed by Mark Dickinson and Victor Stinner in :gh:`73468`.)
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* A new function :func:`~math.fma` for fused multiply-add operations has been
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added. This function computes ``x * y + z`` with only a single round, and so
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avoids any intermediate loss of precision. It wraps the ``fma()`` function
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provided by C99, and follows the specification of the IEEE 754
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"fusedMultiplyAdd" operation for special cases.
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(Contributed by Mark Dickinson and Victor Stinner in :gh:`73468`.)
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mmap
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----
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@ -593,18 +589,18 @@ pathlib
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* Add *recurse_symlinks* keyword-only argument to :meth:`pathlib.Path.glob`
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and :meth:`~pathlib.Path.rglob`.
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(Contributed by Barney Gale in :gh:`77609`).
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(Contributed by Barney Gale in :gh:`77609`.)
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* Add *follow_symlinks* keyword-only argument to :meth:`~pathlib.Path.is_file`,
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:meth:`~pathlib.Path.is_dir`, :meth:`~pathlib.Path.owner`,
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:meth:`~pathlib.Path.group`.
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(Contributed by Barney Gale in :gh:`105793`, and Kamil Turek in
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:gh:`107962`).
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:gh:`107962`.)
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* Return files and directories from :meth:`pathlib.Path.glob` and
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:meth:`~pathlib.Path.rglob` when given a pattern that ends with "``**``". In
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earlier versions, only directories were returned.
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(Contributed by Barney Gale in :gh:`70303`).
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(Contributed by Barney Gale in :gh:`70303`.)
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pdb
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---
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@ -653,6 +649,8 @@ statistics
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from a fixed number of discrete samples.
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(Contributed by Raymond Hettinger in :gh:`115863`.)
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.. _whatsnew313-subprocess:
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subprocess
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----------
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@ -685,7 +683,7 @@ time
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* On Windows, :func:`time.time()` now uses the
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``GetSystemTimePreciseAsFileTime()`` clock to have a resolution better
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than 1 us, instead of the ``GetSystemTimeAsFileTime()`` clock which has a
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than 1 μs, instead of the ``GetSystemTimeAsFileTime()`` clock which has a
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resolution of 15.6 ms.
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(Contributed by Victor Stinner in :gh:`63207`.)
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@ -782,6 +780,7 @@ zipimport
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* Gains support for ZIP64 format files. Everybody loves huge code right?
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(Contributed by Tim Hatch in :gh:`94146`.)
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.. Add improved modules above alphabetically, not here at the end.
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Optimizations
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=============
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@ -792,7 +791,8 @@ Optimizations
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* The :mod:`subprocess` module uses :func:`os.posix_spawn` in more situations
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including the default where ``close_fds=True`` on many modern platforms. This
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should provide a noteworthy performance increase launching processes on
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FreeBSD and Solaris. See the ``subprocess`` section above for details.
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FreeBSD and Solaris. See the :ref:`subprocess <whatsnew313-subprocess>`
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section above for details.
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(Contributed by Jakub Kulik in :gh:`113117`.)
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.. _whatsnew313-jit-compiler:
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@ -831,6 +831,8 @@ The internal architecture is roughly as follows.
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*copy-and-patch*. It has no runtime dependencies, but there is a new
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build-time dependency on LLVM.
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See :pep:`744` for more details.
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(JIT by Brandt Bucher, inspired by a paper by Haoran Xu and Fredrik Kjolstad.
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Tier 2 IR by Mark Shannon and Guido van Rossum.
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Tier 2 optimizer by Ken Jin.)
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@ -844,7 +846,7 @@ Deprecated
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emits :exc:`DeprecationWarning` since 3.13
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and will be removed in Python 3.16.
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Use the ``'w'`` format code instead.
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(contributed by Hugo van Kemenade in :gh:`80480`)
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(Contributed by Hugo van Kemenade in :gh:`80480`.)
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* :mod:`ctypes`: Deprecate undocumented :func:`!ctypes.SetPointerType`
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and :func:`!ctypes.ARRAY` functions.
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@ -860,6 +862,11 @@ Deprecated
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membership in :data:`~dis.hasarg` instead.
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(Contributed by Irit Katriel in :gh:`109319`.)
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* :ref:`frame-objects`:
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Calling :meth:`frame.clear` on a suspended frame raises :exc:`RuntimeError`
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(as has always been the case for an executing frame).
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(Contributed by Irit Katriel in :gh:`79932`.)
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* :mod:`getopt` and :mod:`optparse` modules: They are now
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:term:`soft deprecated`: the :mod:`argparse` module should be used for new projects.
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Previously, the :mod:`optparse` module was already deprecated, its removal
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@ -889,6 +896,12 @@ Deprecated
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removal in Python 3.15. Use :func:`os.path.isreserved` to detect reserved
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paths on Windows.
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* :mod:`platform`:
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:func:`~platform.java_ver` is deprecated and will be removed in 3.15.
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It was largely untested, had a confusing API,
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and was only useful for Jython support.
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(Contributed by Nikita Sobolev in :gh:`116349`.)
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* :mod:`pydoc`: Deprecate undocumented :func:`!pydoc.ispackage` function.
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(Contributed by Zackery Spytz in :gh:`64020`.)
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@ -917,6 +930,10 @@ Deprecated
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Replace it with the :envvar:`PYTHONLEGACYWINDOWSFSENCODING` environment variable.
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(Contributed by Inada Naoki in :gh:`73427`.)
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* :mod:`tarfile`:
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The undocumented and unused ``tarfile`` attribute of :class:`tarfile.TarFile`
|
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is deprecated and scheduled for removal in Python 3.16.
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* :mod:`traceback`: The field *exc_type* of :class:`traceback.TracebackException`
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is deprecated. Use *exc_type_str* instead.
|
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|
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@ -949,28 +966,19 @@ Deprecated
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the new :ref:`type parameter syntax <type-params>` instead.
|
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(Contributed by Michael The in :gh:`107116`.)
|
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|
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* :mod:`wave`: Deprecate the ``getmark()``, ``setmark()`` and ``getmarkers()``
|
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methods of the :class:`wave.Wave_read` and :class:`wave.Wave_write` classes.
|
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They will be removed in Python 3.15.
|
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(Contributed by Victor Stinner in :gh:`105096`.)
|
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|
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* Calling :meth:`frame.clear` on a suspended frame raises :exc:`RuntimeError`
|
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(as has always been the case for an executing frame).
|
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(Contributed by Irit Katriel in :gh:`79932`.)
|
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|
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* Assignment to a function's :attr:`~function.__code__` attribute where the new code
|
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* :ref:`user-defined-funcs`:
|
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Assignment to a function's :attr:`~function.__code__` attribute where the new code
|
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object's type does not match the function's type, is deprecated. The
|
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different types are: plain function, generator, async generator and
|
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coroutine.
|
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(Contributed by Irit Katriel in :gh:`81137`.)
|
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|
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* The undocumented and unused ``tarfile`` attribute of :class:`tarfile.TarFile`
|
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is deprecated and scheduled for removal in Python 3.16.
|
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* :mod:`wave`: Deprecate the ``getmark()``, ``setmark()`` and ``getmarkers()``
|
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methods of the :class:`wave.Wave_read` and :class:`wave.Wave_write` classes.
|
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They will be removed in Python 3.15.
|
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(Contributed by Victor Stinner in :gh:`105096`.)
|
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|
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* :func:`platform.java_ver` is deprecated and will be removed in 3.15.
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It was largely untested, had a confusing API,
|
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and was only useful for Jython support.
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(Contributed by Nikita Sobolev in :gh:`116349`.)
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.. Add deprecations above alphabetically, not here at the end.
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Pending Removal in Python 3.14
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------------------------------
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@ -1070,7 +1078,8 @@ Pending Removal in Python 3.14
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* :mod:`typing`: :class:`~typing.ByteString`, deprecated since Python 3.9,
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now causes a :exc:`DeprecationWarning` to be emitted when it is used.
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* :class:`!urllib.parse.Quoter` is deprecated: it was not intended to be a
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* :mod:`urllib`:
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:class:`!urllib.parse.Quoter` is deprecated: it was not intended to be a
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public API.
|
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(Contributed by Gregory P. Smith in :gh:`88168`.)
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|
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|
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@ -1098,6 +1107,12 @@ Pending Removal in Python 3.15
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removal in Python 3.15. Use :func:`os.path.isreserved` to detect reserved
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paths on Windows.
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|
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* :mod:`platform`:
|
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:func:`~platform.java_ver` is deprecated and will be removed in 3.15.
|
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It was largely untested, had a confusing API,
|
||||
and was only useful for Jython support.
|
||||
(Contributed by Nikita Sobolev in :gh:`116349`.)
|
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|
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* :mod:`threading`:
|
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Passing any arguments to :func:`threading.RLock` is now deprecated.
|
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C version allows any numbers of args and kwargs,
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|
|
@ -1107,22 +1122,22 @@ Pending Removal in Python 3.15
|
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|
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* :class:`typing.NamedTuple`:
|
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|
||||
* The undocumented keyword argument syntax for creating NamedTuple classes
|
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* The undocumented keyword argument syntax for creating :class:`!NamedTuple` classes
|
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(``NT = NamedTuple("NT", x=int)``) is deprecated, and will be disallowed in
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3.15. Use the class-based syntax or the functional syntax instead.
|
||||
|
||||
* When using the functional syntax to create a NamedTuple class, failing to
|
||||
pass a value to the 'fields' parameter (``NT = NamedTuple("NT")``) is
|
||||
deprecated. Passing ``None`` to the 'fields' parameter
|
||||
* When using the functional syntax to create a :class:`!NamedTuple` class, failing to
|
||||
pass a value to the *fields* parameter (``NT = NamedTuple("NT")``) is
|
||||
deprecated. Passing ``None`` to the *fields* parameter
|
||||
(``NT = NamedTuple("NT", None)``) is also deprecated. Both will be
|
||||
disallowed in Python 3.15. To create a NamedTuple class with 0 fields, use
|
||||
disallowed in Python 3.15. To create a :class:`!NamedTuple` class with 0 fields, use
|
||||
``class NT(NamedTuple): pass`` or ``NT = NamedTuple("NT", [])``.
|
||||
|
||||
* :class:`typing.TypedDict`: When using the functional syntax to create a
|
||||
TypedDict class, failing to pass a value to the 'fields' parameter (``TD =
|
||||
TypedDict("TD")``) is deprecated. Passing ``None`` to the 'fields' parameter
|
||||
:class:`!TypedDict` class, failing to pass a value to the *fields* parameter (``TD =
|
||||
TypedDict("TD")``) is deprecated. Passing ``None`` to the *fields* parameter
|
||||
(``TD = TypedDict("TD", None)``) is also deprecated. Both will be disallowed
|
||||
in Python 3.15. To create a TypedDict class with 0 fields, use ``class
|
||||
in Python 3.15. To create a :class:`!TypedDict` class with 0 fields, use ``class
|
||||
TD(TypedDict): pass`` or ``TD = TypedDict("TD", {})``.
|
||||
|
||||
* :mod:`wave`: Deprecate the ``getmark()``, ``setmark()`` and ``getmarkers()``
|
||||
|
|
@ -1130,11 +1145,6 @@ Pending Removal in Python 3.15
|
|||
They will be removed in Python 3.15.
|
||||
(Contributed by Victor Stinner in :gh:`105096`.)
|
||||
|
||||
* :func:`platform.java_ver` is deprecated and will be removed in 3.15.
|
||||
It was largely untested, had a confusing API,
|
||||
and was only useful for Jython support.
|
||||
(Contributed by Nikita Sobolev in :gh:`116349`.)
|
||||
|
||||
Pending Removal in Python 3.16
|
||||
------------------------------
|
||||
|
||||
|
|
@ -1575,15 +1585,15 @@ Changes in the Python API
|
|||
than directories only. Users may add a trailing slash to match only
|
||||
directories.
|
||||
|
||||
* :c:func:`!PyCode_GetFirstFree` is an ustable API now and has been renamed
|
||||
* :c:func:`!PyCode_GetFirstFree` is an unstable API now and has been renamed
|
||||
to :c:func:`PyUnstable_Code_GetFirstFree`.
|
||||
(Contributed by Bogdan Romanyuk in :gh:`115781`)
|
||||
(Contributed by Bogdan Romanyuk in :gh:`115781`.)
|
||||
|
||||
|
||||
Build Changes
|
||||
=============
|
||||
|
||||
* Autoconf 2.71 and aclocal 1.16.4 is now required to regenerate
|
||||
* Autoconf 2.71 and aclocal 1.16.4 are now required to regenerate
|
||||
the :file:`configure` script.
|
||||
(Contributed by Christian Heimes in :gh:`89886`.)
|
||||
|
||||
|
|
@ -1606,10 +1616,10 @@ Build Changes
|
|||
:ref:`limited C API <limited-c-api>`.
|
||||
(Contributed by Victor Stinner in :gh:`85283`.)
|
||||
|
||||
* ``wasm32-wasi`` is now a tier 2 platform.
|
||||
* ``wasm32-wasi`` is now a :pep:`11` tier 2 platform.
|
||||
(Contributed by Brett Cannon in :gh:`115192`.)
|
||||
|
||||
* ``wasm32-emscripten`` is no longer a supported platform.
|
||||
* ``wasm32-emscripten`` is no longer a :pep:`11` supported platform.
|
||||
(Contributed by Brett Cannon in :gh:`115192`.)
|
||||
|
||||
|
||||
|
|
@ -1835,6 +1845,13 @@ Porting to Python 3.13
|
|||
and ``setitimer()`` functions.
|
||||
(Contributed by Victor Stinner in :gh:`108765`.)
|
||||
|
||||
* On Windows, ``Python.h`` no longer includes the ``<stddef.h>`` standard
|
||||
header file. If needed, it should now be included explicitly. For example, it
|
||||
provides ``offsetof()`` function, and ``size_t`` and ``ptrdiff_t`` types.
|
||||
Including ``<stddef.h>`` explicitly was already needed by all other
|
||||
platforms, the ``HAVE_STDDEF_H`` macro is only defined on Windows.
|
||||
(Contributed by Victor Stinner in :gh:`108765`.)
|
||||
|
||||
* If the :c:macro:`Py_LIMITED_API` macro is defined, :c:macro:`!Py_BUILD_CORE`,
|
||||
:c:macro:`!Py_BUILD_CORE_BUILTIN` and :c:macro:`!Py_BUILD_CORE_MODULE` macros
|
||||
are now undefined by ``<Python.h>``.
|
||||
|
|
@ -1844,7 +1861,7 @@ Porting to Python 3.13
|
|||
were removed. They should be replaced by the new macros ``Py_TRASHCAN_BEGIN``
|
||||
and ``Py_TRASHCAN_END``.
|
||||
|
||||
A tp_dealloc function that has the old macros, such as::
|
||||
A ``tp_dealloc`` function that has the old macros, such as::
|
||||
|
||||
static void
|
||||
mytype_dealloc(mytype *p)
|
||||
|
|
@ -1869,13 +1886,6 @@ Porting to Python 3.13
|
|||
Note that ``Py_TRASHCAN_BEGIN`` has a second argument which
|
||||
should be the deallocation function it is in.
|
||||
|
||||
* On Windows, ``Python.h`` no longer includes the ``<stddef.h>`` standard
|
||||
header file. If needed, it should now be included explicitly. For example, it
|
||||
provides ``offsetof()`` function, and ``size_t`` and ``ptrdiff_t`` types.
|
||||
Including ``<stddef.h>`` explicitly was already needed by all other
|
||||
platforms, the ``HAVE_STDDEF_H`` macro is only defined on Windows.
|
||||
(Contributed by Victor Stinner in :gh:`108765`.)
|
||||
|
||||
Deprecated
|
||||
----------
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue