Issues

• [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

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

  python/mypy#22149 · opened on Oct 9, 2026
  4

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

  python/mypy#22138 · opened on Oct 7, 2026

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

  python/mypy#22174 · opened on Oct 7, 2026
  8

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

  python/mypy#22122 · opened on Oct 6, 2026
  1

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

  python/mypy#22117 · opened on Oct 5, 2026
  1

• Strange issue with circular imports and module-level __getattr__

  python/mypy#22115 · opened on Oct 5, 2026
  1

• Re-think our high level logic for type inference

  python/mypy#22063 · opened on Sep 28, 2026
  11

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

  python/mypy#22026 · opened on Sep 23, 2026
  1

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

  python/mypy#21998 · opened on Sep 16, 2026
  4

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

  python/mypy#21997 · opened on Sep 16, 2026