Sourced from mypy's changelog.

Mypy Release Notes

Next release

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 on Read 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 with enable_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 function
def f[T](https://github.com/python/mypy/blob/master/x: T) -> T: ...
reveal_type(f(1))  # Revealed type is 'int'
Generic class
class C[T]:
def init(self, x: T) -> None:
self.x = x
c = C('a')
reveal_type(c.x)  # Revealed type is 'str'
Type alias
type A[T] = C[list[T]]

This feature was contributed by Jukka Lehtosalo.

Support for functools.partial

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

This example will now produce an error:

from functools import partial
</tr></table> 

... (truncated)

• 570b90a Bump version to 1.11
• b3a102e Fix RawExpressionType.accept crash with --cache-fine-grained (#17588)
• aec04c7 Fix PEP 604 isinstance caching (#17563)
• cb44e4d Fix typing.TypeAliasType being undefined on python < 3.12 (#17558)
• 6cf9180 Fix types.GenericAlias lookup crash (#17543)
• 64c1ebf Bump version to 1.11.1+dev
• dbd5f5c Remove +dev from version for 1.11 release
• f0a8c69 Update CHANGELOG for mypy 1.11 (#17540)
• 371f780 CHANGELOG.md update for 1.11 (#17539)
• 2563da0 Fix daemon crash on invalid type in TypedDict (#17495)
• Additional commits viewable in compare view

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