8000 Prepare release 4.12.0rc1 by JelleZijlstra · Pull Request #402 · python/typing_extensions · GitHub
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merged 3 commits into from
May 16, 2024
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Prepare release 4.12.0rc1 #402

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Prepare release 4.12.0rc1
JelleZijlstra May 16, 2024
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JelleZijlstra May 16, 2024
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JelleZijlstra May 16, 2024
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67 changes: 41 additions & 26 deletions CHANGELOG.md
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# Release 4.12.0a1 and 4.12.0a2

These releases primarily test a revised release workflow. If all goes
well, release 4.12.0rc1 will follow soon.

- Backport the `typing.NoDefault` sentinel object from Python 3.13.
TypeVars, ParamSpecs and TypeVarTuples without default values now have
their `__default__` attribute set to this sentinel value.
- TypeVars, ParamSpecs and TypeVarTuples now have a `has_default()`
method, matching `typing.TypeVar`, `typing.ParamSpec` and
`typing.TypeVarTuple` on Python 3.13+.
- TypeVars, ParamSpecs and TypeVarTuples with `default=None` passed to
their constructors now have their `__default__` attribute set to `None`
at runtime rather than `types.NoneType`.
- Fix most tests for `TypeVar`, `ParamSpec` and `TypeVarTuple` on Python
3.13.0b1 and newer.
- Backport CPython PR [#118774](https://github.com/python/cpython/pull/118774),
allowing type parameters without default values to follow those with
default values in some type parameter lists. Patch by Alex Waygood,
backporting a CPython PR by Jelle Zijlstra.
- It is now disallowed to use a `TypeVar` with a default value after a
`TypeVarTuple` in a type parameter list. This matches the CPython
implementation of PEP 696 on Python 3.13+.
- Fix bug in PEP-696 implementation where default values for `ParamSpec`s
would be cast to tuples if a list was provided as the default value.
Patch by Alex Waygood.
# Release 4.12.0rc1 (May 16, 2024)

This release focuses on compatibility with the upcoming release of
Python 3.13. Most changes are related to the implementation of type
parameter defaults (PEP 696).

Thanks to all of the people who contributed patches, especially Alex
Waygood, who did most of the work adapting typing-extensions to the
CPython PEP 696 implementation.

Full changelog:

- Improve the implementation of type parameter defaults (PEP 696)
- Backport the `typing.NoDefault` sentinel object from Python 3.13.
TypeVars, ParamSpecs and TypeVarTuples without default values now have
their `__default__` attribute set to this sentinel value.
- TypeVars, ParamSpecs and TypeVarTuples now have a `has_default()`
method, matching `typing.TypeVar`, `typing.ParamSpec` and
`typing.TypeVarTuple` on Python 3.13+.
- TypeVars, ParamSpecs and TypeVarTuples with `default=None` passed to
their constructors now have their `__default__` attribute set to `None`
at runtime rather than `types.NoneType`.
- Fix most tests for `TypeVar`, `ParamSpec` and `TypeVarTuple` on Python
3.13.0b1 and newer.
- Backport CPython PR [#118774](https://github.com/python/cpython/pull/118774),
allowing type parameters without default values to follow those with
default values in some type parameter lists. Patch by Alex Waygood,
backporting a CPython PR by Jelle Zijlstra.
- It is now disallowed to use a `TypeVar` with a default value after a
`TypeVarTuple` in a type parameter list. This matches the CPython
implementation of PEP 696 on Python 3.13+.
- Fix bug in PEP-696 implementation where a default value for a `ParamSpec`
would be cast to a tuple if a list was provided.
Patch by Alex Waygood.
- Fix `Protocol` tests on Python 3.13.0a6 and newer. 3.13.0a6 adds a new
`__static_attributes__` attribute to all classes in Python,
which broke some assumptions made by the implementation of
Expand All @@ -46,6 +54,13 @@ well, release 4.12.0rc1 will follow soon.
`typing.ContextManager` and `typing.AsyncContextManager` on Python
3.13+.
- Backport `types.CapsuleType` from Python 3.13.
- Releases are now made using [Trusted Publishers](https://docs.pypi.org/trusted-publishers/)
improving the security of the release process. Patch by Jelle Zijlstra.

# Release 4.12.0a1 and 4.12.0a2 (May 16, 2024)

These releases primarily test a revised release workflow. If all goes
well, release 4.12.0rc1 will follow soon.

# Release 4.11.0 (April 5, 2024)

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2 changes: 1 addition & 1 deletion pyproject.toml
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Expand Up @@ -6,7 +6,7 @@ build-backend = "flit_core.buildapi"
# Project metadata
[project]
name = "typing_extensions"
version = "4.12.0a2"
version = "4.12.0rc1"
description = "Backported and Experimental Type Hints for Python 3.8+"
readme = "README.md"
requires-python = ">=3.8"
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