Pending Removal in Python 3.13¶

Modules (seePEP 594):

• aifc

• audioop

• cgi

• cgitb

• chunk

• crypt

• imghdr

• mailcap

• msilib

• nis

• nntplib

• ossaudiodev

• pipes

• sndhdr

• spwd

• sunau

• telnetlib

• uu

• xdrlib

Other modules:

• lib2to3, and the2to3 program (gh-84540)

APIs:

• configparser.LegacyInterpolation (gh-90765)

• locale.resetlocale() (gh-90817)

• turtle.RawTurtle.settiltangle() (gh-50096)

• unittest.findTestCases() (gh-50096)

• unittest.getTestCaseNames() (gh-50096)

• unittest.makeSuite() (gh-50096)

• unittest.TestProgram.usageExit() (gh-67048)

• webbrowser.MacOSX (gh-86421)

• classmethod descriptor chaining (gh-89519)

• importlib.resources deprecated methods:

  • contents()

  • is_resource()

  • open_binary()

  • open_text()

  • path()

  • read_binary()

  • read_text()

  Useimportlib.resources.files() instead. Refer toimportlib-resources: Migrating from Legacy (gh-106531)

Pending Removal in Python 3.14¶

• argparse: Thetype,choices, andmetavar parametersofargparse.BooleanOptionalAction are deprecatedand will be removed in 3.14.(Contributed by Nikita Sobolev ingh-92248.)

• ast: The following features have been deprecated in documentationsince Python 3.8, now cause aDeprecationWarning to be emitted atruntime when they are accessed or used, and will be removed in Python 3.14:

  • ast.Num

  • ast.Str

  • ast.Bytes

  • ast.NameConstant

  • ast.Ellipsis

  Useast.Constant instead.(Contributed by Serhiy Storchaka ingh-90953.)

• asyncio:

  • The child watcher classesMultiLoopChildWatcher,FastChildWatcher,AbstractChildWatcherandSafeChildWatcher are deprecated andwill be removed in Python 3.14.(Contributed by Kumar Aditya ingh-94597.)

  • asyncio.set_child_watcher(),asyncio.get_child_watcher(),asyncio.AbstractEventLoopPolicy.set_child_watcher() andasyncio.AbstractEventLoopPolicy.get_child_watcher() are deprecatedand will be removed in Python 3.14.(Contributed by Kumar Aditya ingh-94597.)

  • Theget_event_loop() method of thedefault event loop policy now emits aDeprecationWarning if thereis no current event loop set and it decides to create one.(Contributed by Serhiy Storchaka and Guido van Rossum ingh-100160.)

• collections.abc: DeprecatedByteString.PreferSequence orBuffer.For use in typing, prefer a union, likebytes|bytearray,orcollections.abc.Buffer.(Contributed by Shantanu Jain ingh-91896.)

• email: Deprecated theisdst parameter inemail.utils.localtime().(Contributed by Alan Williams ingh-72346.)

• importlib:__package__ and__cached__ will cease to be set ortaken into consideration by the import system (gh-97879).

• importlib.abc deprecated classes:

  • importlib.abc.ResourceReader

  • importlib.abc.Traversable

  • importlib.abc.TraversableResources

  Useimportlib.resources.abc classes instead:

  • importlib.resources.abc.Traversable

  • importlib.resources.abc.TraversableResources

  (Contributed by Jason R. Coombs and Hugo van Kemenade ingh-93963.)

• 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 codevolume and maintenance burden.(Contributed by Raymond Hettinger ingh-101588.)

• multiprocessing: The default start method will change to a safer one onLinux, BSDs, and other non-macOS POSIX platforms where'fork' is currentlythe default (gh-84559). Adding a runtime warning about this was deemed toodisruptive as the majority of code is not expected to care. Use theget_context() orset_start_method() APIs to explicitly specify whenyour coderequires'fork'. SeeContexts and start methods.

• pathlib:is_relative_to() andrelative_to(): passing additional arguments isdeprecated.

• pkgutil:find_loader() andget_loader()now raiseDeprecationWarning;useimportlib.util.find_spec() instead.(Contributed by Nikita Sobolev ingh-97850.)

• pty:

  • master_open(): usepty.openpty().

  • slave_open(): usepty.openpty().

• sqlite3:

  • version andversion_info.

  • execute() andexecutemany()ifnamed placeholders are used andparameters is a sequence instead of adict.

• typing:ByteString, deprecated since Python 3.9,now causes aDeprecationWarning to be emitted when it is used.

• urllib:urllib.parse.Quoter is deprecated: it was not intended to be apublic API.(Contributed by Gregory P. Smith ingh-88168.)

Pending Removal in Python 3.15¶

• http.server.CGIHTTPRequestHandler will be removed along with itsrelated--cgi flag topython-mhttp.server. It was obsolete andrarely used. No direct replacement exists.Anything is better than CGIto interface a web server with a request handler.

• importlib:

  • load_module() method: useexec_module() instead.

• locale:locale.getdefaultlocale() was deprecated in Python 3.11and originally planned for removal in Python 3.13 (gh-90817),but removal has been postponed to Python 3.15.Uselocale.setlocale(),locale.getencoding() andlocale.getlocale() instead.(Contributed by Hugo van Kemenade ingh-111187.)

• pathlib:pathlib.PurePath.is_reserved() is deprecated and scheduled forremoval in Python 3.15. From Python 3.13 onwards, useos.path.isreservedto detect reserved paths on Windows.

• 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 ingh-116349.)

• sysconfig:

  • Thecheck_home argument ofsysconfig.is_python_build() has beendeprecated since Python 3.12.

• threading:Passing any arguments tothreading.RLock() is now deprecated.C version allows any numbers of args and kwargs,but they are just ignored. Python version does not allow any arguments.All arguments will be removed fromthreading.RLock() in Python 3.15.(Contributed by Nikita Sobolev ingh-102029.)

• typing.NamedTuple:

  • The undocumented keyword argument syntax for creatingNamedTuple classes(NT=NamedTuple("NT",x=int)) is deprecated, and will be disallowed in3.15. Use the class-based syntax or the functional syntax instead.

• types:

  • types.CodeType: Accessingco_lnotab wasdeprecated inPEP 626since 3.10 and was planned to be removed in 3.12,but it only got a properDeprecationWarning in 3.12.May be removed in 3.15.(Contributed by Nikita Sobolev ingh-101866.)

• typing:

  • When using the functional syntax to create aNamedTuple class, failing topass a value to thefields parameter (NT=NamedTuple("NT")) isdeprecated. PassingNone to thefields parameter(NT=NamedTuple("NT",None)) is also deprecated. Both will bedisallowed in Python 3.15. To create aNamedTuple class with 0 fields, useclassNT(NamedTuple):pass orNT=NamedTuple("NT",[]).

• typing.TypedDict: When using the functional syntax to create aTypedDict class, failing to pass a value to thefields parameter (TD=TypedDict("TD")) is deprecated. PassingNone to thefields parameter(TD=TypedDict("TD",None)) is also deprecated. Both will be disallowedin Python 3.15. To create aTypedDict class with 0 fields, useclassTD(TypedDict):pass orTD=TypedDict("TD",{}).

• wave: Deprecate thegetmark(),setmark() andgetmarkers()methods of thewave.Wave_read andwave.Wave_write classes.They will be removed in Python 3.15.(Contributed by Victor Stinner ingh-105096.)

Pending Removal in Python 3.16¶

• The import system:

  • Setting__loader__ on a module whilefailing to set__spec__.loaderis deprecated. In Python 3.16,__loader__ will cease to be set ortaken into consideration by the import system or the standard library.

• array:array.array'u' type (wchar_t):use the'w' type instead (Py_UCS4).

• builtins:~bool, bitwise inversion on bool.

• symtable:Deprecatesymtable.Class.get_methods() due to the lack of interest.(Contributed by Bénédikt Tran ingh-119698.)

Pending Removal in Future Versions¶

The following APIs will be removed in the future,although there is currently no date scheduled for their removal.

• argparse: Nesting argument groups and nesting mutually exclusivegroups are deprecated.

• array’s'u' format code (gh-57281)

• builtins:

  • bool(NotImplemented).

  • Generators:throw(type,exc,tb) andathrow(type,exc,tb)signature is deprecated: usethrow(exc) andathrow(exc) instead,the single argument signature.

  • Currently Python accepts numeric literals immediately followed by keywords,for example0inx,1orx,0if1else2. It allows confusing andambiguous expressions like[0x1forxiny] (which can be interpreted as[0x1forxiny] or[0x1forxiny]). A syntax warning is raisedif the numeric literal is immediately followed by one of keywordsand,else,for,if,in,is andor. In a future release itwill be changed to a syntax error. (gh-87999)

  • Support for__index__() and__int__() method returning non-int type:these methods will be required to return an instance of a strict subclass ofint.

  • Support for__float__() method returning a strict subclass offloat: these methods will be required to return an instance offloat.

  • Support for__complex__() method returning a strict subclass ofcomplex: these methods will be required to return an instance ofcomplex.

  • Delegation ofint() to__trunc__() method.

  • Passing a complex number as thereal orimag argument in thecomplex() constructor is now deprecated; it should only be passedas a single positional argument.(Contributed by Serhiy Storchaka ingh-109218.)

• calendar:calendar.January andcalendar.February constants aredeprecated and replaced bycalendar.JANUARY andcalendar.FEBRUARY.(Contributed by Prince Roshan ingh-103636.)

• codeobject.co_lnotab: use thecodeobject.co_lines() methodinstead.

• datetime:

  • utcnow():usedatetime.datetime.now(tz=datetime.UTC).

  • utcfromtimestamp():usedatetime.datetime.fromtimestamp(timestamp,tz=datetime.UTC).

• gettext: Plural value must be an integer.

• importlib:

  • cache_from_source()debug_override parameter isdeprecated: use theoptimization parameter instead.

• importlib.metadata:

  • EntryPoints tuple interface.

  • ImplicitNone on return values.

• mailbox: Use of StringIO input and text mode is deprecated, useBytesIO and binary mode instead.

• os: Callingos.register_at_fork() in multi-threaded process.

• pydoc.ErrorDuringImport: A tuple value forexc_info parameter isdeprecated, use an exception instance.

• re: More strict rules are now applied for numerical group referencesand group names in regular expressions. Only sequence of ASCII digits is nowaccepted as a numerical reference. The group name in bytes patterns andreplacement strings can now only contain ASCII letters and digits andunderscore.(Contributed by Serhiy Storchaka ingh-91760.)

• sre_compile,sre_constants andsre_parse modules.

• shutil:rmtree()’sonerror parameter is deprecated inPython 3.12; use theonexc parameter instead.

• ssl options and protocols:

  • ssl.SSLContext without protocol argument is deprecated.

  • ssl.SSLContext:set_npn_protocols() andselected_npn_protocol() are deprecated: use ALPNinstead.

  • ssl.OP_NO_SSL* options

  • ssl.OP_NO_TLS* options

  • ssl.PROTOCOL_SSLv3

  • ssl.PROTOCOL_TLS

  • ssl.PROTOCOL_TLSv1

  • ssl.PROTOCOL_TLSv1_1

  • ssl.PROTOCOL_TLSv1_2

  • ssl.TLSVersion.SSLv3

  • ssl.TLSVersion.TLSv1

  • ssl.TLSVersion.TLSv1_1

• threading methods:

  • threading.Condition.notifyAll(): usenotify_all().

  • threading.Event.isSet(): useis_set().

  • threading.Thread.isDaemon(),threading.Thread.setDaemon():usethreading.Thread.daemon attribute.

  • threading.Thread.getName(),threading.Thread.setName():usethreading.Thread.name attribute.

  • threading.currentThread(): usethreading.current_thread().

  • threading.activeCount(): usethreading.active_count().

• typing.Text (gh-92332).

• unittest.IsolatedAsyncioTestCase: it is deprecated to return a valuethat is notNone from a test case.

• urllib.parse deprecated functions:urlparse() instead

  • splitattr()

  • splithost()

  • splitnport()

  • splitpasswd()

  • splitport()

  • splitquery()

  • splittag()

  • splittype()

  • splituser()

  • splitvalue()

  • to_bytes()

• urllib.request:URLopener andFancyURLopener style of invoking requests isdeprecated. Use newerurlopen() functions and methods.

• wsgiref:SimpleHandler.stdout.write() should not do partialwrites.

• xml.etree.ElementTree: Testing the truth value of anElement is deprecated. In a future release itwill always returnTrue. Prefer explicitlen(elem) orelemisnotNone tests instead.

• zipimport.zipimporter.load_module() is deprecated:useexec_module() instead.

C API Deprecations¶