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Pattern matching a dataclass with different field type fails for Python >= 3.13

bugmypy got something wrongmypy got something wrong

topic-dataclasses

topic-match-statementPython 3.10's match statementPython 3.10's match statement

Status: Open.

#20904 In python/mypy;

· mtsokol opened on Feb 26, 2026

Improve t-string support by checking formats, etc

feature

Status: Open.

#20903 In python/mypy;

· nascheme opened on Feb 25, 2026

Mypy degrades inferred generic return type from tuple[type[T], ...] to object

bugmypy got something wrongmypy got something wrong

topic-inferenceWhen to infer types or require explicit annotationsWhen to infer types or require explicit annotations

topic-join-v-unionUsing join vs. using unionsUsing join vs. using unions

Status: Open.

#20891 In python/mypy;

· Vanerio opened on Feb 24, 2026

Backslashes become forward slashes in literal types in tests

bugmypy got something wrongmypy got something wrong

topic-tests

Status: Open.

#20884 In python/mypy;

· wyattscarpenter opened on Feb 24, 2026

[dev] audit -skip tests

topic-developerIssues relevant to mypy developersIssues relevant to mypy developers

topic-tests

Status: Open.

#20881 In python/mypy;

· wyattscarpenter opened on Feb 24, 2026

Inconsistent feeling handling of Any in binder

bugmypy got something wrongmypy got something wrong

topic-type-narrowingConditional type narrowing / binderConditional type narrowing / binder

Status: Open.

#20870 In python/mypy;

· hauntsaninja opened on Feb 23, 2026

Type checking <code>struct.unpack</code>

feature

topic-pluginsThe plugin API and ideas for new pluginsThe plugin API and ideas for new plugins

Status: Open.

#20869 In python/mypy;

· sakgoyal opened on Feb 23, 2026

error: Expression is of type "Any", not "Any" (Using <code>Any</code> as a <code>type</code>)

bugmypy got something wrongmypy got something wrong

Status: Open.

#20859 In python/mypy;

· George-Ogden opened on Feb 22, 2026

Runs forever at 100% CPU for generic protocol with bounded TypeVar argument

bugmypy got something wrongmypy got something wrong

crash

topic-protocols

topic-recursive-types

Status: Open.

#20828 In python/mypy;

· opk12 opened on Feb 16, 2026

mypy should check qualname (and other special dunders)

bugmypy got something wrongmypy got something wrong

topic-runtime-semanticsmypy doesn't model runtime semantics correctlymypy doesn't model runtime semantics correctly

Status: Open.

#20821 In python/mypy;

· A5rocks opened on Feb 16, 2026

Incorrect narrowing between two different unions

bugmypy got something wrongmypy got something wrong

topic-type-narrowingConditional type narrowing / binderConditional type narrowing / binder

Status: Open.

#20820 In python/mypy;

· A5rocks opened on Feb 15, 2026

Special dunder attributes on dataclass not treated as <code>__init__</code> args

bugmypy got something wrongmypy got something wrong

topic-dataclasses

topic-runtime-semanticsmypy doesn't model runtime semantics correctlymypy doesn't model runtime semantics correctly

Status: Open.

#20819 In python/mypy;

· ktbarrett opened on Feb 15, 2026