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What's New in 3.12: List 'Improved Modules' alphabetically (#105315)
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Hugo van Kemenade
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1 changed files with 107 additions and 107 deletions
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@ -74,10 +74,10 @@ New typing features:
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* :pep:`688`: Making the buffer protocol accessible in Python
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* :ref:`whatsnew312-pep695`
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* :ref:`whatsnew312-pep692`
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* :ref:`whatsnew312-pep695`
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* :pep:`698`: Override Decorator for Static Typing
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Important deprecations, removals or restrictions:
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@ -179,7 +179,7 @@ same quote as the containing f-string. Let's cover these in detail:
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must be defined in a single line even if outside f-strings expressions could
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span multiple lines (like literal lists being defined over multiple lines),
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making them harder to read. In Python 3.12 you can now define expressions
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spaning multiple lines and include comments on them:
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spanning multiple lines and include comments on them:
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>>> f"This is the playlist: {", ".join([
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... 'Take me back to Eden', # My, my, those eyes like fire
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@ -216,7 +216,7 @@ f-string raises a :exc:`SyntaxError`:
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^^^
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SyntaxError: f-string: invalid syntax. Perhaps you forgot a comma?
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but the error message doesn't include the exact location of the error withing the line and
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but the error message doesn't include the exact location of the error within the line and
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also has the expression artificially surrounded by parentheses. In Python 3.12, as f-strings
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are parsed with the PEG parser, error messages can be more precise and show the entire line:
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@ -553,46 +553,6 @@ csv
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provide finer grained control of ``None`` and empty strings by
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:class:`~csv.writer` objects.
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inspect
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-------
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* Add :func:`inspect.markcoroutinefunction` to mark sync functions that return
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a :term:`coroutine` for use with :func:`inspect.iscoroutinefunction`.
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(Contributed Carlton Gibson in :gh:`99247`.)
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* Add :func:`inspect.getasyncgenstate` and :func:`inspect.getasyncgenlocals`
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for determining the current state of asynchronous generators.
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(Contributed by Thomas Krennwallner in :issue:`35759`.)
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* The performance of :func:`inspect.getattr_static` has been considerably
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improved. Most calls to the function should be at least 2x faster than they
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were in Python 3.11, and some may be 6x faster or more. (Contributed by Alex
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Waygood in :gh:`103193`.)
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pathlib
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-------
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* Add support for subclassing :class:`pathlib.PurePath` and
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:class:`~pathlib.Path`, plus their Posix- and Windows-specific variants.
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Subclasses may override the :meth:`~pathlib.PurePath.with_segments` method
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to pass information between path instances.
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* Add :meth:`~pathlib.Path.walk` for walking the directory trees and generating
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all file or directory names within them, similar to :func:`os.walk`.
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(Contributed by Stanislav Zmiev in :gh:`90385`.)
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* Add *walk_up* optional parameter to :meth:`pathlib.PurePath.relative_to`
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to allow the insertion of ``..`` entries in the result; this behavior is
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more consistent with :func:`os.path.relpath`.
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(Contributed by Domenico Ragusa in :issue:`40358`.)
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* Add :meth:`pathlib.Path.is_junction` as a proxy to :func:`os.path.isjunction`.
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(Contributed by Charles Machalow in :gh:`99547`.)
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* Add *case_sensitive* optional parameter to :meth:`pathlib.Path.glob`,
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:meth:`pathlib.Path.rglob` and :meth:`pathlib.PurePath.match` for matching
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the path's case sensitivity, allowing for more precise control over the matching process.
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dis
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---
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@ -610,6 +570,22 @@ fractions
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* Objects of type :class:`fractions.Fraction` now support float-style
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formatting. (Contributed by Mark Dickinson in :gh:`100161`.)
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inspect
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-------
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* Add :func:`inspect.markcoroutinefunction` to mark sync functions that return
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a :term:`coroutine` for use with :func:`inspect.iscoroutinefunction`.
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(Contributed Carlton Gibson in :gh:`99247`.)
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* Add :func:`inspect.getasyncgenstate` and :func:`inspect.getasyncgenlocals`
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for determining the current state of asynchronous generators.
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(Contributed by Thomas Krennwallner in :issue:`35759`.)
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* The performance of :func:`inspect.getattr_static` has been considerably
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improved. Most calls to the function should be at least 2x faster than they
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were in Python 3.11, and some may be 6x faster or more. (Contributed by Alex
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Waygood in :gh:`103193`.)
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itertools
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---------
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@ -669,6 +645,30 @@ os.path
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* Add :func:`os.path.splitroot` to split a path into a triad
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``(drive, root, tail)``. (Contributed by Barney Gale in :gh:`101000`.)
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pathlib
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-------
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* Add support for subclassing :class:`pathlib.PurePath` and
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:class:`~pathlib.Path`, plus their Posix- and Windows-specific variants.
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Subclasses may override the :meth:`~pathlib.PurePath.with_segments` method
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to pass information between path instances.
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* Add :meth:`~pathlib.Path.walk` for walking the directory trees and generating
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all file or directory names within them, similar to :func:`os.walk`.
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(Contributed by Stanislav Zmiev in :gh:`90385`.)
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* Add *walk_up* optional parameter to :meth:`pathlib.PurePath.relative_to`
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to allow the insertion of ``..`` entries in the result; this behavior is
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more consistent with :func:`os.path.relpath`.
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(Contributed by Domenico Ragusa in :issue:`40358`.)
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* Add :meth:`pathlib.Path.is_junction` as a proxy to :func:`os.path.isjunction`.
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(Contributed by Charles Machalow in :gh:`99547`.)
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* Add *case_sensitive* optional parameter to :meth:`pathlib.Path.glob`,
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:meth:`pathlib.Path.rglob` and :meth:`pathlib.PurePath.match` for matching
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the path's case sensitivity, allowing for more precise control over the matching process.
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pdb
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---
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@ -746,6 +746,38 @@ statistics
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for computing the Spearman correlation of ranked data.
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(Contributed by Raymond Hettinger in :gh:`95861`.)
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sys
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---
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* Add :func:`sys.activate_stack_trampoline` and
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:func:`sys.deactivate_stack_trampoline` for activating and deactivating
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stack profiler trampolines,
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and :func:`sys.is_stack_trampoline_active` for querying if stack profiler
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trampolines are active.
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(Contributed by Pablo Galindo and Christian Heimes
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with contributions from Gregory P. Smith [Google] and Mark Shannon
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in :gh:`96123`.)
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* Add :data:`sys.last_exc` which holds the last unhandled exception that
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was raised (for post-mortem debugging use cases). Deprecate the
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three fields that have the same information in its legacy form:
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:data:`sys.last_type`, :data:`sys.last_value` and :data:`sys.last_traceback`.
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(Contributed by Irit Katriel in :gh:`102778`.)
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* :func:`sys._current_exceptions` now returns a mapping from thread-id to an
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exception instance, rather than to a ``(typ, exc, tb)`` tuple.
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(Contributed by Irit Katriel in :gh:`103176`.)
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tempfile
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--------
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* The :class:`tempfile.NamedTemporaryFile` function has a new optional parameter
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*delete_on_close* (Contributed by Evgeny Zorin in :gh:`58451`.)
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* :func:`tempfile.mkdtemp` now always returns an absolute path, even if the
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argument provided to the *dir* parameter is a relative path.
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.. _whatsnew-typing-py312:
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threading
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---------
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@ -780,49 +812,6 @@ types
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:ref:`user-defined-generics` when subclassed. (Contributed by
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James Hilton-Balfe and Alex Waygood in :gh:`101827`.)
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unicodedata
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-----------
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* The Unicode database has been updated to version 15.0.0. (Contributed by
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Benjamin Peterson in :gh:`96734`).
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unittest
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--------
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Added ``--durations`` command line option, showing the N slowest test cases::
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python3 -m unittest --durations=3 lib.tests.test_threading
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.....
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Slowest test durations
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----------------------------------------------------------------------
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1.210s test_timeout (Lib.test.test_threading.BarrierTests)
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1.003s test_default_timeout (Lib.test.test_threading.BarrierTests)
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0.518s test_timeout (Lib.test.test_threading.EventTests)
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(0.000 durations hidden. Use -v to show these durations.)
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----------------------------------------------------------------------
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Ran 158 tests in 9.869s
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OK (skipped=3)
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(Contributed by Giampaolo Rodola in :issue:`4080`)
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uuid
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----
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* Add a :ref:`command-line interface <uuid-cli>`.
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(Contributed by Adam Chhina in :gh:`88597`.)
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tempfile
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--------
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* The :class:`tempfile.NamedTemporaryFile` function has a new optional parameter
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*delete_on_close* (Contributed by Evgeny Zorin in :gh:`58451`.)
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* :func:`tempfile.mkdtemp` now always returns an absolute path, even if the
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argument provided to the *dir* parameter is a relative path.
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.. _whatsnew-typing-py312:
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typing
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------
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@ -877,27 +866,38 @@ typing
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* Add ``frozen_default`` parameter to :func:`typing.dataclass_transform`.
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(Contributed by Erik De Bonte in :gh:`99957`.)
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sys
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---
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unicodedata
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-----------
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* Add :func:`sys.activate_stack_trampoline` and
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:func:`sys.deactivate_stack_trampoline` for activating and deactivating
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stack profiler trampolines,
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and :func:`sys.is_stack_trampoline_active` for querying if stack profiler
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trampolines are active.
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(Contributed by Pablo Galindo and Christian Heimes
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with contributions from Gregory P. Smith [Google] and Mark Shannon
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in :gh:`96123`.)
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* The Unicode database has been updated to version 15.0.0. (Contributed by
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Benjamin Peterson in :gh:`96734`).
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* Add :data:`sys.last_exc` which holds the last unhandled exception that
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was raised (for post-mortem debugging use cases). Deprecate the
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three fields that have the same information in its legacy form:
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:data:`sys.last_type`, :data:`sys.last_value` and :data:`sys.last_traceback`.
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(Contributed by Irit Katriel in :gh:`102778`.)
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unittest
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--------
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* :func:`sys._current_exceptions` now returns a mapping from thread-id to an
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exception instance, rather than to a ``(typ, exc, tb)`` tuple.
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(Contributed by Irit Katriel in :gh:`103176`.)
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Added ``--durations`` command line option, showing the N slowest test cases::
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python3 -m unittest --durations=3 lib.tests.test_threading
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.....
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Slowest test durations
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----------------------------------------------------------------------
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1.210s test_timeout (Lib.test.test_threading.BarrierTests)
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1.003s test_default_timeout (Lib.test.test_threading.BarrierTests)
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0.518s test_timeout (Lib.test.test_threading.EventTests)
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(0.000 durations hidden. Use -v to show these durations.)
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----------------------------------------------------------------------
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Ran 158 tests in 9.869s
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OK (skipped=3)
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(Contributed by Giampaolo Rodola in :issue:`4080`)
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uuid
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----
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* Add a :ref:`command-line interface <uuid-cli>`.
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(Contributed by Adam Chhina in :gh:`88597`.)
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Optimizations
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@ -1486,7 +1486,7 @@ Changes in the Python API
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1,13-1,17: FSTRING_MIDDLE ' end'
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1,17-1,18: FSTRING_END '"'
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Aditionally, there may be some minor behavioral changes as a consecuence of the
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Additionally, there may be some minor behavioral changes as a consecuence of the
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changes required to support :pep:`701`. Some of these changes include:
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* Some final ``DEDENT`` tokens are now emitted within the bounds of the
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@ -1757,7 +1757,7 @@ Porting to Python 3.12
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before storing it. (Contributed by Mark Shannon in :gh:`101578`.)
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* ``_Py_RefTotal`` is no longer authoritative and only kept around
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for ABI compabitility. Note that it is an internal global and only
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for ABI compatibility. Note that it is an internal global and only
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available on debug builds. If you happen to be using it then you'll
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need to start using ``_Py_GetGlobalRefTotal()``.
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