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Mypy Release Notes

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Mypy 1.11

We’ve just uploaded mypy 1.11 to the Python Package Index (PyPI). Mypy is a static type checker for Python. This release includes new features, performance improvements and bug fixes. You can install it as follows:

python3 -m pip install -U mypy

You can read the full documentation for this release onRead the Docs.

Support Python 3.12 Syntax for Generics (PEP 695)

Mypy now supports the new type parameter syntax introduced in Python 3.12 (PEP 695).This feature is still experimental and must be enabled with the--enable-incomplete-feature=NewGenericSyntax flag, or withenable_incomplete_feature = NewGenericSyntax in the mypy configuration file.We plan to enable this by default in the next mypy feature release.

This example demonstrates the new syntax:

# Generic functiondeff[T](https://github.com/python/mypy/blob/master/x:T)->T: ...reveal_type(f(1))# Revealed type is 'int'GenericclassclassC[T]:definit(self,x:T)->None:self.x=xc=C('a')reveal_type(c.x)# Revealed type is 'str'TypealiastypeA[T]=C[list[T]]

This feature was contributed by Jukka Lehtosalo.

Support forfunctools.partial

Mypy now type checks uses offunctools.partial. Previously mypy would accept arbitrary arguments.

This example will now produce an error:

fromfunctoolsimportpartial</tr></table>

... (truncated)

• 789f02c Bump version to 1.11.2
• 917cc75 An alternative fix for a union-like literal string (#17639)
• 7d805b3 Unwrap TypedDict item types before storing (#17640)
• 32675dd Revert "Fix Literal strings containing pipe characters" (#17638)
• 778542b Revert "FixRawExpressionType.accept crash with--cache-fine-grained" (#1...
• 14ab742 Bump version to 1.11.2+dev
• 570b90a Bump version to 1.11
• b3a102e FixRawExpressionType.accept crash with--cache-fine-grained (#17588)
• aec04c7 Fix PEP 604 isinstance caching (#17563)
• cb44e4d Fixtyping.TypeAliasType being undefined on python < 3.12 (#17558)
• Additional commits viewable incompare view

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