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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 mypyYou 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=NewGenericSyntaxflag, or withenable_incomplete_feature = NewGenericSyntaxin 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.partialMypy 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)
789f02c
Bump version to 1.11.2917cc75
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 "Fix RawExpressionType.accept crash with
--cache-fine-grained" (#1...14ab742
Bump version to 1.11.2+dev570b90a
Bump version to 1.11b3a102e
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)