Issues

• mypyc silently drops class keyword arguments

  bugtopic-mypyctopic-runtime-semantics
  python/mypy#21938 · Filter by author quiet-lab opened on Sep 4, 2026

• [mypyc] Design discussion: build-system-neutral C generation CLI (mypyc cgen) for projects not using setuptools

  featuretopic-mypyc
  python/mypy#21923 · Filter by author trim21 opened on Sep 1, 2026
  1

• Documentation: type[BaseClass] accepting subclasses

  bugtopic-mypyc
  python/mypy#20213 · Filter by author paulocheque opened on Nov 9, 2025
  1

• Mypyc runtime TypeError exceptions when you change inherited method to a staticmethod

  bugtopic-mypyc
  python/mypy#19558 · Filter by author CoolCat467 opened on Aug 1, 2025
  3

• Mypyc gcc compilation fails with specific duplicate variable definition

  crashtopic-mypyc
  python/mypy#19557 · Filter by author CoolCat467 opened on Aug 1, 2025
  2

• [mypyc] indexing fixed-length tuples is extremely slow and gets slower with increse in length

  bugperformancetopic-mypyc
  python/mypy#19537 · Filter by author Bobronium opened on Jul 30, 2025
  1

• ImportError: dynamic module does not define module export function

  bugtopic-mypyc
  python/mypy#19531 · Filter by author greenteahamburgerdeeee opened on Jul 29, 2025

• Mypyc produces module that crashes (segmentation fault) when executed

  crashtopic-mypyc
  python/mypy#18992 · Filter by author svalentin opened on Apr 28, 2025
  1

• Mypyc: Crash when using property deleter

  featuretopic-descriptorstopic-mypyc
  python/mypy#17928 · Filter by author aatle opened on Oct 13, 2024
  1

• AssertionError in make_module_translation_map

  crashtopic-mypyc
  python/mypy#17072 · Filter by author justinc1 opened on Mar 28, 2024
  1

• ‘CPyModule__ctypes’ undeclared

  bugtopic-mypyc
  python/mypy#16687 · Filter by author juhasch opened on Dec 20, 2023
  3

• mypy 1.7.1 build error on ppc: FATAL: Section too large, can't encode r_address (0x109e874) into 24-bits of scattered relocation entry

  bugtopic-mypyc
  python/mypy#16684 · Filter by author barracuda156 opened on Dec 20, 2023
  9

• Refurb crashes on Mypy 1.7.0

  bugquestiontopic-mypyc
  python/mypy#16497 · Filter by author dosisod opened on Nov 15, 2023
  18

• mypyc: Any subclass of BytesIO will always generate an exception when instantiated

  bugtopic-mypyc
  python/mypy#16209 · Filter by author bertbarabas opened on Oct 1, 2023

• _PyType_Lookup: Assertion !PyErr_Occurred()' failed. in two mypyc/test/test_run.py` tests

  crashgood-second-issuetopic-mypyc
  python/mypy#16043 · Filter by author mgorny opened on Sep 4, 2023
  1

• Read/write property does not work with "allow_interpreted_subclasses"

  bugtopic-mypyc
  python/mypy#15828 · Filter by author feibl opened on Aug 8, 2023

• Mypyc crashes on conditionally-defined class

  crashtopic-mypyc
  python/mypy#15716 · Filter by author nickdrozd opened on Jul 19, 2023
  4

• mypyc doesn't support attrs.field

  bugtopic-attrstopic-mypyc
  python/mypy#15267 · Filter by author ikonst opened on May 18, 2023

• assert == on two floating numbers? Really?

  topic-mypyctopic-tests
  python/mypy#15221 · Filter by author mcepl opened on May 11, 2023
  1

• Crash in mypyc with recursive tuple TypeAlias

  bugtopic-mypyc
  python/mypy#15092 · Filter by author eswald opened on Apr 20, 2023

• [mypyc] generator support

  topic-mypyc
  Unread
  python/mypy#15058·r3m0t opened Apr 15, 2023 · Updated May 17, 2023·Draft
  5

• [mypyc] Fix native tuple unboxing

  topic-mypyc
  Unread
  python/mypy#15025·ichard26 opened Apr 9, 2023 · Updated Feb 28, 2024
  7

• Error: "Local variable "x" has inferred type None; add an annotation", while annotation seems to be provided.

  bugtopic-mypyc
  python/mypy#14967 · Filter by author ghuls opened on Mar 27, 2023
  1

• Optionally flag known mypyc compatibility issues in mypy

  featuretopic-mypyc
  python/mypy#14715 · Filter by author JukkaL opened on Feb 16, 2023

• [mypyc] TypeError: bool object expected; got numpy.bool_

  bugtopic-mypyc
  python/mypy#14405 · Filter by author matoksoz opened on Jan 6, 2023
  3