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GeezerVison is showing github.com — Initial support for Python 3.15.0a8 by cdce8p · Pull Request #21255 · python/mypy

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@cdce8p

@cdce8p cdce8p commented Apr 16, 2026

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Some minor changes to be able to compile mypy with mypyc on Python 3.15.0a8.

  • Update typing-extensions to >=4.14.0 for Python >=3.15 due to the removal of typing.no_type_check_decorator
    Remove deprecated typing.no_type_check_decorator cpython#133601
    https://docs.python.org/3/library/typing.html#typing.no_type_check_decorator
    https://github.com/python/typing_extensions/blob/4.14.0/CHANGELOG.md
  • TypeAliasType.__qualname__ was added in TypeAliasType objects have no __qualname__ cpython#139817
  • Some new FutureWarnings for b64_decode
    Base64 decode with altchars still accepts non-altchars cpython#125346
    gh-125346: Fix decoding with non-standard Base64 alphabet cpython#141128

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cdce8p added 3 commits April 16, 2026 18:38
@cdce8p
Update typing-extensions pin for removal of typing.no_type_check_deco…
419701d 
…rator

https://github.com/python/typing_extensions/blob/4.14.0/CHANGELOG.md
@cdce8p
TypeAliasType.__qualname__ changes in 3.15.0a2
278e481
@cdce8p
Update mypyc tests
0911def
@cdce8p cdce8p changed the title Initial support for Python 315 Initial support for Python 3.15.0a8 Apr 16, 2026
@cdce8p cdce8p mentioned this pull request Apr 16, 2026
Compiled wheels for Python 3.15 alpha to avoid severe CI slowdown #21229
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github-actions Bot commented Apr 16, 2026

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According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅
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hauntsaninja
hauntsaninja approved these changes Apr 16, 2026
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Thanks!

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@hauntsaninja
hauntsaninja merged commit ebaa73a into python:master Apr 16, 2026
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@cdce8p
cdce8p deleted the python-315-initial branch April 16, 2026 18:14
@cdce8p

cdce8p commented Apr 16, 2026

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@hauntsaninja Is this something worth cherry-picking for the 1.20.2? It would allow users to compile mypy with mypyc themselves for 3.15.0a8 if they want to.
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@hauntsaninja

hauntsaninja commented Apr 16, 2026

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Seems like a good idea, thanks for suggesting it!
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@hauntsaninja hauntsaninja mentioned this pull request Apr 16, 2026
1.20 and 2.0 Release Planning #20726
Closed
JukkaL pushed a commit that referenced this pull request Apr 21, 2026
@cdce8p @JukkaL
Initial support for Python 3.15.0a8 (#21255)
ba28610 
Some minor changes to be able to compile mypy with mypyc on Python
3.15.0a8.

- Update `typing-extensions` to `>=4.14.0` for Python `>=3.15` due to
the removal of `typing.no_type_check_decorator`
python/cpython#133601

https://docs.python.org/3/library/typing.html#typing.no_type_check_decorator
https://github.com/python/typing_extensions/blob/4.14.0/CHANGELOG.md
- `TypeAliasType.__qualname__` was added in
python/cpython#139817
- Some new FutureWarnings for b64_decode
python/cpython#125346
python/cpython#141128
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@hauntsaninja hauntsaninja hauntsaninja approved these changes

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2 participants

@cdce8p @hauntsaninja
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