Issues

• Allow tighter types with protocols and overloads

  bug
  python/mypy#22199 · Filter by author A5rocks opened on Oct 13, 2026

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

  bugtopic-error-reportingtopic-type-alias
  python/mypy#22194 · Filter by author NiklasvonM opened on Oct 13, 2026

• __get__ override not recognized in NamedTuple

  bugtopic-descriptorstopic-named-tuple
  python/mypy#22193 · Filter by author VinDuv opened on Oct 13, 2026

• Post-run verification of results

  feature
  python/mypy#22189 · Filter by author A5rocks opened on Oct 12, 2026

• T-string below Python 3.14 also reports import-not-found for string.templatelib on line 1

  bugtopic-parser
  python/mypy#22184 · Filter by author chrikrah opened on Oct 12, 2026
  2

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

  bug
  python/mypy#22181 · Filter by author Moussa-Mikhail 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

  topic-parsertopic-pep-695
  python/mypy#22176 · Filter by author seunghyun-24 opened on Oct 11, 2026
  1

• TypeIs doesn't narrow a NewType

  bugtopic-typeguard-typeis
  python/mypy#22175 · Filter by author twavv opened on Oct 11, 2026
  1

• 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
  10

• 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
  3

• 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