python/mypy

Announcement issue for plugin API changes
#6617 · msullivan opened on Apr 3, 2019
24

#21102

· JukkaL opened

on Mar 25, 2026

`isinstance` doesn't work with `TypeAlias` for classes inherited from `NamedTuple`

bug

#21100

· MAKMED1337 opened

on Mar 24, 2026

Type-narrowing of a list item for an inline list multiplied with a type-guard on said item

feature

topic-type-narrowing

#21099

· Avasam opened

on Mar 24, 2026

Does not recognize computed exception tuples

bug

#21092

· helmutg opened

on Mar 23, 2026

Mypy suggests `types-Pygments` but `--install-types` doesn't install it

bug

#21068

· rentruewang opened

on Mar 22, 2026

Generic `NamedTuple` does appear attribute-less in `match` statements, and member type information is erased

bug

#21050

· jonded94 opened

on Mar 19, 2026

TypeForm does not overlap with classes that represent special forms at runtime.

bug

topic-reachability

topic-type-narrowing

#21048

· danielknell opened

on Mar 19, 2026

subtle cache corruption when using dataclass transform leading to `Cannot determine type of "<my-dataclass-transform>" [has-type]` and a big complicated codebase (Pomodouroboros)

bug

#21043

· glyph opened

on Mar 18, 2026

Tuple comparison does not check comparability of element types

bug

#21042

· ktbarrett opened

on Mar 18, 2026

[i386/i686] Fatal Python error: Segmentation fault while running the tests

crash

#21040

· mr-c opened

on Mar 18, 2026

Classes inheriting from `NamedTuple` can't have `ParamSpec` as generic type parameter

#21039

· jonded94 opened

on Mar 18, 2026

Undefined names used as decorators on top of `TypedDict` are not reported

bug

semantic-analyzer

topic-typed-dict

#21030

· bzoracler opened

on Mar 17, 2026

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Incremental mode does extra work with --follow-imports=skip

`isinstance` doesn't work with `TypeAlias` for classes inherited from `NamedTuple`

Type-narrowing of a list item for an inline list multiplied with a type-guard on said item

Does not recognize computed exception tuples

Mypy suggests `types-Pygments` but `--install-types` doesn't install it

Generic `NamedTuple` does appear attribute-less in `match` statements, and member type information is erased

TypeForm does not overlap with classes that represent special forms at runtime.

subtle cache corruption when using dataclass transform leading to `Cannot determine type of "<my-dataclass-transform>" [has-type]` and a big complicated codebase (Pomodouroboros)

Tuple comparison does not check comparability of element types

[i386/i686] Fatal Python error: Segmentation fault while running the tests

Classes inheriting from `NamedTuple` can't have `ParamSpec` as generic type parameter

Undefined names used as decorators on top of `TypedDict` are not reported

Uh oh!

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