Unreleased

  • Add typing_extensions.Buffer, a marker class for buffer types, as proposed by PEP 688. Equivalent to collections.abc.Buffer in Python 3.12. Patch by Jelle Zijlstra.
  • Backport CPython PR 26067 (originally by Yurii Karabas), ensuring that isinstance() calls on protocols raise TypeError when the protocol is not decorated with @runtime_checkable. Patch by Alex Waygood.

Release 4.5.0 (February 14, 2023)

  • Runtime support for PEP 702, adding typing_extensions.deprecated. Patch by Jelle Zijlstra.
  • Add better default value for TypeVar default parameter, PEP 696. Enables runtime check if None was passed as default. Patch by Marc Mueller (@cdce8p).
  • The @typing_extensions.override decorator now sets the .__override__ attribute. Patch by Steven Troxler.
  • Fix get_type_hints() on cross-module inherited TypedDict in 3.9 and 3.10. Patch by Carl Meyer.
  • Add frozen_default parameter on dataclass_transform. Patch by Erik De Bonte.

Release 4.4.0 (October 6, 2022)

  • Add typing_extensions.Any a backport of python 3.11's Any class which is subclassable at runtime. (backport from python/cpython#31841, by Shantanu and Jelle Zijlstra). Patch by James Hilton-Balfe (@Gobot1234).
  • Add initial support for TypeVarLike default parameter, PEP 696. Patch by Marc Mueller (@cdce8p).
  • Runtime support for PEP 698, adding typing_extensions.override. Patch by Jelle Zijlstra.
  • Add the infer_variance parameter to TypeVar, as specified in PEP 695. Patch by Jelle Zijlstra.

Release 4.3.0 (July 1, 2022)

  • Add typing_extensions.NamedTuple, allowing for generic NamedTuples on Python <3.11 (backport from python/cpython#92027, by Serhiy Storchaka). Patch by Alex Waygood (@AlexWaygood).
  • Adjust typing_extensions.TypedDict to allow for generic TypedDicts on Python <3.11 (backport from python/cpython#27663, by Samodya Abey). Patch by Alex Waygood (@AlexWaygood).

Release 4.2.0 (April 17, 2022)

  • Re-export typing.Unpack and typing.TypeVarTuple on Python 3.11.
  • Add ParamSpecArgs and ParamSpecKwargs to __all__.
  • Improve “accepts only single type” error messages.
  • Improve the distributed package. Patch by Marc Mueller (@cdce8p).
  • Update typing_extensions.dataclass_transform to rename the field_descriptors parameter to field_specifiers and accept arbitrary keyword arguments.
  • Add typing_extensions.get_overloads and typing_extensions.clear_overloads, and add registry support to typing_extensions.overload. Backport from python/cpython#89263.
  • Add typing_extensions.assert_type. Backport from bpo-46480.
  • Drop support for Python 3.6. Original patch by Adam Turner (@AA-Turner).

Release 4.1.1 (February 13, 2022)

  • Fix importing typing_extensions on Python 3.7.0 and 3.7.1. Original patch by Nikita Sobolev (@sobolevn).

Release 4.1.0 (February 12, 2022)

  • Runtime support for PEP 646, adding typing_extensions.TypeVarTuple and typing_extensions.Unpack.
  • Add interaction of Required and NotRequired with __required_keys__, __optional_keys__ and get_type_hints(). Patch by David Cabot (@d-k-bo).
  • Runtime support for PEP 675 and typing_extensions.LiteralString.
  • Add Never and assert_never. Backport from bpo-46475.
  • ParamSpec args and kwargs are now equal to themselves. Backport from bpo-46676. Patch by Gregory Beauregard (@GBeauregard).
  • Add reveal_type. Backport from bpo-46414.
  • Runtime support for PEP 681 and typing_extensions.dataclass_transform.
  • Annotated can now wrap ClassVar and Final. Backport from bpo-46491. Patch by Gregory Beauregard (@GBeauregard).
  • Add missed Required and NotRequired to __all__. Patch by Yuri Karabas (@uriyyo).
  • The @final decorator now sets the __final__ attribute on the decorated object to allow runtime introspection. Backport from bpo-46342.
  • Add is_typeddict. Patch by Chris Moradi (@chrismoradi) and James Hilton-Balfe (@Gobot1234).

Release 4.0.1 (November 30, 2021)

  • Fix broken sdist in release 4.0.0. Patch by Adam Turner (@AA-Turner).
  • Fix equality comparison for Required and NotRequired. Patch by Jelle Zijlstra (@jellezijlstra).
  • Fix usage of Self as a type argument. Patch by Chris Wesseling (@CharString) and James Hilton-Balfe (@Gobot1234).

Release 4.0.0 (November 14, 2021)

  • Starting with version 4.0.0, typing_extensions uses Semantic Versioning. See the README for more information.
  • Dropped support for Python versions 3.5 and older, including Python 2.7.
  • Simplified backports for Python 3.6.0 and newer. Patch by Adam Turner (@AA-Turner).

Added in version 4.0.0

  • Runtime support for PEP 673 and typing_extensions.Self. Patch by James Hilton-Balfe (@Gobot1234).
  • Runtime support for PEP 655 and typing_extensions.Required and NotRequired. Patch by David Foster (@davidfstr).

Removed in version 4.0.0

The following non-exported but non-private names have been removed as they are unneeded for supporting Python 3.6 and newer.

  • TypingMeta
  • OLD_GENERICS
  • SUBS_TREE
  • HAVE_ANNOTATED
  • HAVE_PROTOCOLS
  • V_co
  • VT_co

Previous releases

Prior to release 4.0.0 we did not provide a changelog. Please check the Git history for details.