mypy · Issues· 3239 open
Open on GitHubLocally synced open issues (discussions stay on GitHub)
- #21985
mypy RecursionError analyzing pint.facets.plain.quantity.PlainQuantity
crashtopic-recursive-typesUpdated Sep 18, 2026 - #21935
2.4 Release Planning
metaUpdated Sep 17, 2026 - #9457
Attribute narrowing isn't aware of side effects
bugtopic-literal-typestopic-enumtopic-reachabilitytopic-type-narrowingUpdated Sep 17, 2026 - #21998
Possible bug - mypy rejects subclassing `Any` typed `*args` entries within a function (OK in python; pyright and pyrefly say OK) though allowing the same from keyword parameters
bugtopic-callsUpdated Sep 17, 2026 - #21997
Checking a match on an enum becomes quadratically slow after the variable was narrowed by an == check
bugperformancetopic-enumUpdated Sep 17, 2026 - #21994
Narrow built-in signature hook return types to CallableType
featuretopic-pluginsUpdated Sep 17, 2026 - #21222
Shadow file and transform source broken when using parallel type checking
bugparallel checkingUpdated Sep 16, 2026 - #21907
"INTERNAL_ERROR": generic fun w/ Callable param w/ constrained return type followed by `*args` typed as `*Tuple[int, float]` crashes mypy
crashUpdated Sep 15, 2026 - #21468
Crash in match-statement's subject expression with an unpacked tuple
crashtopic-match-statementUpdated Sep 14, 2026 - #21974
Concurrent parallel invocations can lose worker-options files
bugparallel checkingUpdated Sep 14, 2026 - #21768
Overload resolution collapses to Any when Any is nested inside a generic argument, not just top-level
bugUpdated Sep 14, 2026 - #21968
Exhaustiveness of type tuple[bool, bool]
bugtopic-match-statementtopic-reachabilityUpdated Sep 13, 2026 - #13916
Using mypy via pre-commit
bugdocumentationtopic-incrementalpriority-0-hightopic-usabilityUpdated Sep 13, 2026 - #21948
New parser deviates from old parser in edge cases with function type comments
bugtopic-parserUpdated Sep 12, 2026 - #3737
Unable to specify a default value for a generic parameter
featuretopic-type-variablespriority-0-highUpdated Sep 11, 2026