Issues

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

  python/mypy#22176 Filter by author seunghyun-24 opened on Oct 11, 2026
  1

• TypeIs doesn't narrow a NewType

  bug
  python/mypy#22175 Filter by author twavv opened on Oct 11, 2026

• empty directory among multiple targets aborts whole check

  bugtopic-usability
  python/mypy#22173 Filter by author Zocker1999NET opened on Oct 10, 2026
  1

• File x.py is skiped if directory x exists

  bug
  python/mypy#22160 Filter by author lhupfeldt opened on Oct 10, 2026
  1

• Cache sometimes gets ignored for unchanged files

  bugtopic-incremental
  python/mypy#22159 Filter by author A5rocks opened on Oct 10, 2026

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

  bugtopic-protocols
  python/mypy#22151 Filter by author sunny-zuo opened on Oct 9, 2026

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

  bugtopic-match-statementtopic-reachability
  python/mypy#22150 Filter by author jherbel opened on Oct 9, 2026

• new fancy native parser errors on large Literal[<INT>]

  bugtopic-parser
  python/mypy#22149 Filter by author jessekrubin opened on Oct 9, 2026
  4

• Assignment expression in a call argument changes the types of earlier arguments

  bugtopic-pep-572topic-runtime-semanticstopic-type-narrowing
  python/mypy#22138 Filter by author rheard opened on Oct 7, 2026

• [mypy 2.4 regression] Incorrect type narrowing for reversed list of tuples

  bugtopic-overloads
  python/mypy#22174 Filter by author haudren-woven opened on Oct 7, 2026
  8

• isinstance with a tuple of types narrows unsoundly, causing TypeError in mypyc-compiled code

  affects-mypycbugtopic-type-narrowing
  python/mypy#22122 Filter by author VaggelisD opened on Oct 6, 2026
  1

• Have the type of the thing used in the slice for slice error

  feature
  python/mypy#22117 Filter by author A5rocks opened on Oct 5, 2026
  1

• Strange issue with circular imports and module-level __getattr__

  bugtopic-import-cycles
  python/mypy#22115 Filter by author A5rocks opened on Oct 5, 2026
  1

• Re-think our high level logic for type inference

  metatopic-inferencetopic-type-context
  python/mypy#22063 Filter by author ilevkivskyi opened on Sep 28, 2026
  9

• Option to report deprecated only for symbols defined in selected packages (inverse of deprecated_calls_exclude)

  featuretopic-pep-702
  python/mypy#22026 Filter by author llucax opened on Sep 23, 2026
  1

• sqlite3.OperationalError: disk I/O error

  crashtopic-incremental
  python/mypy#22010 Filter by author WhyNotHugo opened on Sep 20, 2026
  2

• mypy rejects subclassing Any typed *args entries within a function

  bugtopic-calls
  python/mypy#21998 Filter by author willy-b opened on Sep 16, 2026
  4

• Checking a match on an enum becomes quadratically slow after the variable was narrowed by an == check

  performancetopic-enum
  python/mypy#21997 Filter by author sunny-zuo opened on Sep 16, 2026

• Concurrent parallel invocations can lose worker-options files

  bugparallel checking
  python/mypy#21974 Filter by author adamtheturtle opened on Sep 13, 2026
  6

• Exhaustiveness of type tuple[bool, bool]

  bugtopic-match-statementtopic-reachability
  python/mypy#21968 Filter by author JulienPalard opened on Sep 11, 2026
  1

• Type expression arguments aren't recognized as TypeForm when the parameter type is a union containing a TypeForm

  bugtopic-type-form
  python/mypy#21964 Filter by author Viicos opened on Sep 10, 2026
  2

• Self is not rejected when used as a PEP 695 type parameter bound

  bugtopic-self-types
  python/mypy#21960 Filter by author EmmanuelNiyonshuti opened on Sep 8, 2026
  2

• New parser deviates from old parser in edge cases with function type comments

  bugtopic-parser
  python/mypy#21948 Filter by author ilevkivskyi opened on Sep 6, 2026
  2

• Errors from new parser can be worse (compared to old parser)

  bugtopic-parser
  python/mypy#21947 Filter by author ilevkivskyi opened on Sep 6, 2026
  1

• typing.Protocol is explicitly treated as not a type

  bugtopic-protocolstopic-runtime-semantics
  python/mypy#21940 Filter by author chet-manley opened on Sep 4, 2026
  7