Pending Removal in Python 3.14¶
- argparse: The type, choices, and metavar parameters of- argparse.BooleanOptionalActionare deprecated and will be removed in 3.14. (Contributed by Nikita Sobolev in gh-92248.)
- ast: The following features have been deprecated in documentation since Python 3.8, now cause a- DeprecationWarningto be emitted at runtime when they are accessed or used, and will be removed in Python 3.14:- ast.Num
- ast.Str
- ast.Bytes
- ast.NameConstant
- ast.Ellipsis
 - Use - ast.Constantinstead. (Contributed by Serhiy Storchaka in gh-90953.)
- 
- The child watcher classes - MultiLoopChildWatcher,- FastChildWatcher,- AbstractChildWatcherand- SafeChildWatcherare deprecated and will be removed in Python 3.14. (Contributed by Kumar Aditya in gh-94597.)
- asyncio.set_child_watcher(),- asyncio.get_child_watcher(),- asyncio.AbstractEventLoopPolicy.set_child_watcher()and- asyncio.AbstractEventLoopPolicy.get_child_watcher()are deprecated and will be removed in Python 3.14. (Contributed by Kumar Aditya in gh-94597.)
- The - get_event_loop()method of the default event loop policy now emits a- DeprecationWarningif there is no current event loop set and it decides to create one. (Contributed by Serhiy Storchaka and Guido van Rossum in gh-100160.)
 
- collections.abc: Deprecated- ByteString. Prefer- Sequenceor- Buffer. For use in typing, prefer a union, like- bytes | bytearray, or- collections.abc.Buffer. (Contributed by Shantanu Jain in gh-91896.)
- email: Deprecated the isdst parameter in- email.utils.localtime(). (Contributed by Alan Williams in gh-72346.)
- importlib.abcdeprecated classes:- importlib.abc.ResourceReader
- importlib.abc.Traversable
- importlib.abc.TraversableResources
 - Use - importlib.resources.abcclasses instead:- (Contributed by Jason R. Coombs and Hugo van Kemenade in gh-93963.) 
- itertoolshad 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.)
- 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- get_context()or- set_start_method()APIs to explicitly specify when your code requires- 'fork'. See Contexts and start methods.
- pathlib:- is_relative_to()and- relative_to(): passing additional arguments is deprecated.
- pkgutil:- find_loader()and- get_loader()now raise- DeprecationWarning; use- importlib.util.find_spec()instead. (Contributed by Nikita Sobolev in gh-97850.)
- pty:- master_open(): use- pty.openpty().
- slave_open(): use- pty.openpty().
 
- 
- versionand- version_info.
- execute()and- executemany()if named placeholders are used and parameters is a sequence instead of a- dict.
- date and datetime adapter, date and timestamp converter: see the - sqlite3documentation for suggested replacement recipes.
 
- types.CodeType: Accessing- co_lnotabwas deprecated in PEP 626 since 3.10 and was planned to be removed in 3.12, but it only got a proper- DeprecationWarningin 3.12. May be removed in 3.14. (Contributed by Nikita Sobolev in gh-101866.)
- typing:- ByteString, deprecated since Python 3.9, now causes a- DeprecationWarningto be emitted when it is used.
- urllib:- urllib.parse.Quoteris deprecated: it was not intended to be a public API. (Contributed by Gregory P. Smith in gh-88168.)