:mod:`argparse`: The type, choices, and metavar parameters of :class:`!argparse.BooleanOptionalAction` are deprecated and will be removed in 3.14. (Contributed by Nikita Sobolev in :gh:`92248`.)

:mod:`ast`: The following features have been deprecated in documentation since Python 3.8, now cause a :exc:`DeprecationWarning` to be emitted at runtime when they are accessed or used, and will be removed in Python 3.14:

• :class:`!ast.Num`
• :class:`!ast.Str`
• :class:`!ast.Bytes`
• :class:`!ast.NameConstant`
• :class:`!ast.Ellipsis`

Use :class:`ast.Constant` instead. (Contributed by Serhiy Storchaka in :gh:`90953`.)

:mod:`asyncio`:

• The child watcher classes :class:`!asyncio.MultiLoopChildWatcher`, :class:`!asyncio.FastChildWatcher`, :class:`!asyncio.AbstractChildWatcher` and :class:`!asyncio.SafeChildWatcher` are deprecated and will be removed in Python 3.14. (Contributed by Kumar Aditya in :gh:`94597`.)
• :func:`!asyncio.set_child_watcher`, :func:`!asyncio.get_child_watcher`, :meth:`!asyncio.AbstractEventLoopPolicy.set_child_watcher` and :meth:`!asyncio.AbstractEventLoopPolicy.get_child_watcher` are deprecated and will be removed in Python 3.14. (Contributed by Kumar Aditya in :gh:`94597`.)
• The :meth:`~asyncio.get_event_loop` method of the default event loop policy now emits a :exc:`DeprecationWarning` if there is no current event loop set and it decides to create one. (Contributed by Serhiy Storchaka and Guido van Rossum in :gh:`100160`.)

:mod:`email`: Deprecated the isdst parameter in :func:`email.utils.localtime`. (Contributed by Alan Williams in :gh:`72346`.)

:mod:`importlib.abc` deprecated classes:

• :class:`!importlib.abc.ResourceReader`
• :class:`!importlib.abc.Traversable`
• :class:`!importlib.abc.TraversableResources`

Use :mod:`importlib.resources.abc` classes instead:

• :class:`importlib.resources.abc.Traversable`
• :class:`importlib.resources.abc.TraversableResources`

(Contributed by Jason R. Coombs and Hugo van Kemenade in :gh:`93963`.)

:mod:`itertools` had undocumented, inefficient, historically buggy, and inconsistent support for copy, deepcopy, and pickle operations. This will be removed in 3.14 for a significant reduction in code volume and maintenance burden. (Contributed by Raymond Hettinger in :gh:`101588`.)

:mod:`multiprocessing`: The default start method will change to a safer one on Linux, BSDs, and other non-macOS POSIX platforms where 'fork' is currently the default (:gh:`84559`). Adding a runtime warning about this was deemed too disruptive as the majority of code is not expected to care. Use the :func:`~multiprocessing.get_context` or :func:`~multiprocessing.set_start_method` APIs to explicitly specify when your code requires 'fork'. See :ref:`multiprocessing-start-methods`.

:mod:`pathlib`: :meth:`~pathlib.PurePath.is_relative_to` and :meth:`~pathlib.PurePath.relative_to`: passing additional arguments is deprecated.

:mod:`pkgutil`: :func:`!pkgutil.find_loader` and :func:`!pkgutil.get_loader` now raise :exc:`DeprecationWarning`; use :func:`importlib.util.find_spec` instead. (Contributed by Nikita Sobolev in :gh:`97850`.)

:mod:`pty`:

• master_open(): use :func:`pty.openpty`.
• slave_open(): use :func:`pty.openpty`.

:mod:`sqlite3`:

• :data:`!version` and :data:`!version_info`.
• :meth:`~sqlite3.Cursor.execute` and :meth:`~sqlite3.Cursor.executemany` if :ref:`named placeholders <sqlite3-placeholders>` are used and parameters is a sequence instead of a :class:`dict`.

:mod:`urllib`: :class:`!urllib.parse.Quoter` is deprecated: it was not intended to be a public API. (Contributed by Gregory P. Smith in :gh:`88168`.)