4.9.0

This feature release adds typing_extensions.ReadOnly, as specified
by PEP 705, and makes various other improvements, especially to
@typing_extensions.deprecated().

There are no changes since 4.9.0rc1.

4.9.0rc1

• Add support for PEP 705, adding typing_extensions.ReadOnly. Patch
  by Jelle Zijlstra.
• All parameters on NewType.__call__ are now positional-only. This means that
  the signature of typing_extensions.NewType.__call__ now exactly matches the
  signature of typing.NewType.__call__. Patch by Alex Waygood.
• Fix bug with using @deprecated on a mixin class. Inheriting from a
  deprecated class now raises a DeprecationWarning. Patch by Jelle Zijlstra.
• @deprecated now gives a better error message if you pass a non-str
  argument to the msg parameter. Patch by Alex Waygood.
• @deprecated is now implemented as a class for better introspectability.
  Patch by Jelle Zijlstra.
• Exclude __match_args__ from Protocol members.
  Backport of python/cpython#110683 by Nikita Sobolev.
• When creating a typing_extensions.NamedTuple class, ensure __set_name__
  is called on all objects that define __set_name__ and exist in the values
  of the NamedTuple class's class dictionary. Patch by Alex Waygood,
  backporting python/cpython#111876.
• Improve the error message when trying to call issubclass() against a
  Protocol that has non-method members. Patch by Alex Waygood (backporting
  python/cpython#112344, by Randolph Scholz).

4.8.0

Changes since 4.7.1:

• Add typing_extensions.Doc, as proposed by PEP 727. Patch by
  Sebastián Ramírez.
• Drop support for Python 3.7 (including PyPy-3.7). Patch by Alex Waygood.
• Fix bug where get_original_bases() would return incorrect results when
  called on a concrete subclass of a generic class. Patch by Alex Waygood
  (backporting python/cpython#107584, by James
  Hilton-Balfe).
• Fix bug where ParamSpec(default=...) would raise a TypeError on Python
  versions <3.11. Patch by James Hilton-Balfe

No changes since 4.8.0rc1.

4.8.0rc1

• Add typing_extensions.Doc, as proposed by PEP 727. Patch by
  Sebastián Ramírez.
• Drop support for Python 3.7 (including PyPy-3.7). Patch by Alex Waygood.
• Fix bug where get_original_bases() would return incorrect results when
  called on a concrete subclass of a generic class. Patch by Alex Waygood
  (backporting python/cpython#107584, by James
  Hilton-Balfe).
• Fix bug where ParamSpec(default=...) would raise a TypeError on Python
  versions <3.11. Patch by James Hilton-Balfe

4.7.1

• Fix support for TypedDict, NamedTuple and is_protocol on PyPy-3.7 and
  PyPy-3.8. Patch by Alex Waygood. Note that PyPy-3.7 and PyPy-3.8 are unsupported
  by the PyPy project. The next feature release of typing-extensions will
  drop support for PyPy-3.7 and may also drop support for PyPy-3.8.

4.7.0

This is a feature release. Major changes include:

• All non-deprecated names from typing are now re-exported by typing_extensions for convenience
• Add typing_extensions.get_protocol_members and typing_extensions.is_protocol
• Declare support for Python 3.12
• This will be the last feature release to support Python 3.7, which recently reached its end-of-life

Full changelog of versions 4.7.0 and 4.7.0rc1:

Release 4.7.0 (June 28, 2023)

• This is expected to be the last feature release supporting Python 3.7,
  which reaches its end of life on June 27, 2023. Version 4.8.0 will support
  only Python 3.8.0 and up.
• Fix bug where a typing_extensions.Protocol class that had one or more
  non-callable members would raise TypeError when issubclass()
  was called against it, even if it defined a custom __subclasshook__
  method. The correct behaviour -- which has now been restored -- is not to
  raise TypeError in these situations if a custom __subclasshook__ method
  is defined. Patch by Alex Waygood (backporting
  python/cpython#105976).

Release 4.7.0rc1 (June 21, 2023)

• Add typing_extensions.get_protocol_members and
  typing_extensions.is_protocol (backport of CPython PR #104878).
  Patch by Jelle Zijlstra.
• typing_extensions now re-exports all names in the standard library's
  typing module, except the deprecated ByteString. Patch by Jelle
  Zijlstra.
• Due to changes in the implementation of typing_extensions.Protocol,
  typing.runtime_checkable can now be used on typing_extensions.Protocol
  (previously, users had to use typing_extensions.runtime_checkable if they
  were using typing_extensions.Protocol).
• Align the implementation of TypedDict with the implementation in the
  standard library on Python 3.9 and higher.
  typing_extensions.TypedDict is now a function instead of a class. The
  private functions _check_fails, _dict_new, and _typeddict_new
  have been removed. is_typeddict now returns False when called with
  TypedDict itself as the argument. Patch by Jelle Zijlstra.
• Declare support for Python 3.12. Patch by Jelle Zijlstra.
• Fix tests on Python 3.13, which removes support for creating
  TypedDict classes through the keyword-argument syntax. Patch by
  Jelle Zijlstra.
• Fix a regression introduced in v4.6.3 that meant that
  issubclass(object, typing_extensions.Protocol) would erroneously raise
  TypeError. Patch by Alex Waygood (backporting the CPython PR
  python/cpython#105239).
• Allow Protocol classes to inherit from typing_extensions.Buffer or
  collections.abc.Buffer. Patch by Alex Waygood (backporting
  python/cpython#104827, by Jelle Zijlstra).
• Allow classes to inherit from both typing.Protocol and typing_extensions.Protocol
  simultaneously. Since v4.6.0, this caused TypeError to be raised due to a
  metaclass conflict. Patch by Alex Waygood.
• Backport several deprecations from CPython relating to unusual ways to
  create TypedDicts and NamedTuples. CPython PRs #105609 and #105780
  by Alex Waygood; typing_extensions backport by Jelle Zijlstra.
  • Creating a NamedTuple using the functional syntax with keyword arguments
    (NT = NamedTuple("NT", a=int)) is now deprecated.
  • Creating a NamedTuple with zero fields using the syntax NT = NamedTuple("NT")
    or NT = NamedTuple("NT", None) is now deprecated.
  • Creating a TypedDict with zero fields using the syntax TD = TypedDict("TD")
    or TD = TypedDict("TD", None) is now deprecated.
• Fix bug on Python 3.7 where a protocol X that had a member a would not be
  considered an implicit subclass of an unrelated protocol Y that only has a
  member a. Where the members of X are a superset of the members of Y,
  X should always be considered a subclass of Y iff Y is a
  runtime-checkable protocol that only has callable members. Patch by Alex
  Waygood (backporting CPython PR
  python/cpython#105835).

4.7.0rc1

This is a pre-release; please test it! 4.7.0 final is expected in one week (June 28).

Changelog:

• Add typing_extensions.get_protocol_members and
  typing_extensions.is_protocol (backport of CPython PR #104878).
  Patch by Jelle Zijlstra.
• typing_extensions now re-exports all names in the standard library's
  typing module, except the deprecated ByteString. Patch by Jelle
  Zijlstra.
• Due to changes in the implementation of typing_extensions.Protocol,
  typing.runtime_checkable can now be used on typing_extensions.Protocol
  (previously, users had to use typing_extensions.runtime_checkable if they
  were using typing_extensions.Protocol).
• Align the implementation of TypedDict with the implementation in the
  standard library on Python 3.9 and higher.
  typing_extensions.TypedDict is now a function instead of a class. The
  private functions _check_fails, _dict_new, and _typeddict_new
  have been removed. is_typeddict now returns False when called with
  TypedDict itself as the argument. Patch by Jelle Zijlstra.
• Declare support for Python 3.12. Patch by Jelle Zijlstra.
• Fix tests on Python 3.13, which removes support for creating
  TypedDict classes through the keyword-argument syntax. Patch by
  Jelle Zijlstra.
• Fix a regression introduced in v4.6.3 that meant that
  issubclass(object, typing_extensions.Protocol) would erroneously raise
  TypeError. Patch by Alex Waygood (backporting the CPython PR
  python/cpython#105239).
• Allow Protocol classes to inherit from typing_extensions.Buffer or
  collections.abc.Buffer. Patch by Alex Waygood (backporting
  python/cpython#104827, by Jelle Zijlstra).
• Allow classes to inherit from both typing.Protocol and typing_extensions.Protocol
  simultaneously. Since v4.6.0, this caused TypeError to be raised due to a
  metaclass conflict. Patch by Alex Waygood.
• Backport several deprecations from CPython relating to unusual ways to
  create TypedDicts and NamedTuples. CPython PRs #105609 and #105780
  by Alex Waygood; typing_extensions backport by Jelle Zijlstra.
  • Creating a NamedTuple using the functional syntax with keyword arguments
    (NT = NamedTuple("NT", a=int)) is now deprecated.
  • Creating a NamedTuple with zero fields using the syntax NT = NamedTuple("NT")
    or NT = NamedTuple("NT", None) is now deprecated.
  • Creating a TypedDict with zero fields using the syntax TD = TypedDict("TD")
    or TD = TypedDict("TD", None) is now deprecated.
• Fix bug on Python 3.7 where a protocol X that had a member a would not be
  considered an implicit subclass of an unrelated protocol Y that only has a
  member a. Where the members of X are a superset of the members of Y,
  X should always be considered a subclass of Y iff Y is a
  runtime-checkable protocol that only has callable members. Patch by Alex
  Waygood (backporting CPython PR
  python/cpython#105835).