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Announcement issue for plugin API changes
#6617 · msullivan opened on Apr 3, 2019
26
Using mypy via pre-commit
#13916 · hauntsaninja opened on Oct 17, 2022
14

Note log is emitted even if line is ignored
python/mypy#22271 · opened on Oct 22, 2026
var-annotated errors for iteration should point to the line where the variable is defined
python/mypy#22265 · opened on Oct 21, 2026
False negative involving overload and walrus
python/mypy#22264 · opened on Oct 21, 2026
False negative involving partial assignment and walrus
python/mypy#22262 · opened on Oct 21, 2026
import-not-found should be reported for the first non-type-ignored import
python/mypy#22260 · opened on Oct 21, 2026
--allow-redefinition discards narrowing done in if TYPE_CHECKING/if True block
python/mypy#22259 · opened on Oct 21, 2026
Internal error occurs at @typing.overload in large protoc generated files
python/mypy#22257 · opened on Oct 21, 2026
3
Parallel mode: AssertionError in State.reload_meta after a sqlite cache write fails with 'database is locked'
python/mypy#22241 · opened on Oct 21, 2026
2
Functions with global inside should not have their function bodies be stripped
python/mypy#22240 · opened on Oct 21, 2026
1
Spurious note despite suppressing error
python/mypy#22230 · opened on Oct 19, 2026
[mypyc] Invalid C for an int-annotated parameter rebound via nonlocal with --allow-redefinition-new
python/mypy#22221 · opened on Oct 17, 2026
1
corrupt cache causes alarming message
python/mypy#22220 · opened on Oct 17, 2026
1
Boolean literal scrutinee not narrowed by literal patterns in match
python/mypy#22202 · opened on Oct 14, 2026
Allow tighter types with protocols and overloads
python/mypy#22199 · opened on Oct 13, 2026
Error messages show duplicate union items (e.g. "str | str") for overlapping type aliases
python/mypy#22194 · opened on Oct 13, 2026
__get__ override not recognized in NamedTuple
python/mypy#22193 · opened on Oct 13, 2026
Post-run verification of results
python/mypy#22189 · opened on Oct 12, 2026
self: Ident[Self] wrongly rejected for an identity type alias (type Ident[T] = T).
python/mypy#22181 · opened on Oct 12, 2026
Regression in 2.4.0: empty constraint tuple in PEP 695 type parameter (class C[T: ()]) is no longer reported
python/mypy#22176 · opened on Oct 11, 2026
1
TypeIs doesn't narrow a NewType
python/mypy#22175 · opened on Oct 11, 2026
1
empty directory among multiple targets aborts whole check
python/mypy#22173 · opened on Oct 10, 2026
1
File x.py is skiped if directory x exists
python/mypy#22160 · opened on Oct 10, 2026
1
Cache sometimes gets ignored for unchanged files
python/mypy#22159 · opened on Oct 10, 2026
Type variable inferred as Never for a union of callback protocols, depending on earlier calls (causes flakiness)
python/mypy#22151 · opened on Oct 9, 2026
False positive unreachable for None sub-pattern when matching a union of tuples
python/mypy#22150 · opened on Oct 9, 2026

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Issues

Issues

Note log is emitted even if line is ignored

`var-annotated` errors for iteration should point to the line where the variable is defined

False negative involving overload and walrus

False negative involving partial assignment and walrus

`import-not-found` should be reported for the first non-type-ignored import

`--allow-redefinition` discards narrowing done in `if TYPE_CHECKING`/`if True` block

Internal error occurs at @typing.overload in large protoc generated files

Parallel mode: AssertionError in State.reload_meta after a sqlite cache write fails with 'database is locked'

Functions with `global` inside should not have their function bodies be stripped

Spurious note despite suppressing error

[mypyc] Invalid C for an int-annotated parameter rebound via nonlocal with --allow-redefinition-new

corrupt cache causes alarming message

Boolean literal scrutinee not narrowed by literal patterns in match

Allow tighter types with protocols and overloads

Error messages show duplicate union items (e.g. "str | str") for overlapping type aliases

get override not recognized in NamedTuple

Post-run verification of results

self: Ident[Self] wrongly rejected for an identity type alias (type Ident[T] = T).

Regression in 2.4.0: empty constraint tuple in PEP 695 type parameter (`class C[T: ()]`) is no longer reported

TypeIs doesn't narrow a NewType

empty directory among multiple targets aborts whole check

File x.py is skiped if directory x exists

Cache sometimes gets ignored for unchanged files

Type variable inferred as Never for a union of callback protocols, depending on earlier calls (causes flakiness)

False positive `unreachable` for `None` sub-pattern when matching a union of tuples