24 Pull requests merged by 10 people

• Try fixing test times after GC hack

  #19766 merged Aug 30, 2025

• Use some macros in native_internal

  #19757 merged Aug 30, 2025

• Add idlemypyextension to IDE integrations section

  #18615 merged Aug 30, 2025

• --strict-equality for None

  #19718 merged Aug 30, 2025

• Do not display import-related errors after module-level always false assert

  #19347 merged Aug 30, 2025

• Fix forward references in type parameters of overparameterized PEP 695 type aliases

  #19725 merged Aug 29, 2025

• [mypyc] Use defined __new__ method in tp_new and constructor

  #19739 merged Aug 29, 2025

• [mypyc] Speed up implicit __ne__ method

  #19759 merged Aug 29, 2025

• [mypyc] Speed up equality with optional str/bytes types

  #19758 merged Aug 29, 2025

• [mypyc] Refactor IR build of equality and unary operators

  #19756 merged Aug 29, 2025

• Use more compact cache representation for int and str

  #19750 merged Aug 29, 2025

• fix crash with variadic tuple arguments to generic type

  #19705 merged Aug 28, 2025

• Don't write constructor cache without strict optional

  #19752 merged Aug 28, 2025

• Do not use outer context for or expr inference if the LHS has Any

  #19748 merged Aug 28, 2025

• Use u8 for type/symbol tags

  #19741 merged Aug 27, 2025

• [mypyc] feat: __mypyc_empty_tuple__ constant

  #19654 merged Aug 27, 2025

• Cleanup old ast classes in fastparse

  #19743 merged Aug 27, 2025

• Fix unwrapping assignment expressions in match subject

  #19742 merged Aug 27, 2025

• Use 1 byte per type/symbol tag

  #19735 merged Aug 26, 2025

• [mypyc] feat: PyObject_CallObject op for fn(*args) fastpath

  #19631 merged Aug 26, 2025

• Omit errors for class pattern matches against object

  #19709 merged Aug 26, 2025

• Revert "Enable colored output for argparse help in Python 3.14 (#19021)"

  #19721 merged Aug 25, 2025

• Update dependencies

  #19720 merged Aug 25, 2025

• Include base mypy requirements in docs requirements

  #19727 merged Aug 25, 2025

9 Pull requests opened by 7 people

• fix(mypy): prevent incorrect type inference for awaited function calls

  #19723 opened Aug 25, 2025

• docs: move "Configuring and running mypy" section to before "Type system reference"

  #19730 opened Aug 25, 2025

• stubtest: additional guidance on errors when runtime is object.__init__

  #19733 opened Aug 26, 2025

• Improve match subject inference

  #19736 opened Aug 26, 2025

• [stubtest] temporary `--ignore-disjoint-bases` flag

  #19740 opened Aug 26, 2025

• [mypyc] Fix object finalization

  #19749 opened Aug 27, 2025

• Stubtest: check `_value_` for ellipsis-valued stub enum members

  #19760 opened Aug 29, 2025

• Use dedicated tags for most common instances

  #19762 opened Aug 29, 2025

• Use fast Python wrappers in native_internal

  #19765 opened Aug 30, 2025

22 Issues closed by 9 people

• Flag `None` check on value that cannot be `None`

  #18386 closed Aug 30, 2025

• mypy tries to follow imports in files with top-level sys.platform asserts on non-matching platforms

  #19346 closed Aug 30, 2025

• trouble with a str

  #19763 closed Aug 30, 2025

• Crash for certain type alias definitions with parameter with parameter bounded by a forward type

  #19734 closed Aug 29, 2025

• 1.17 Release Planning

  #19306 closed Aug 29, 2025

• MyPy 1.17.1 crashing when using Pandera 0.25.0 and pandas-stubs 2.3.2.250827

  #19754 closed Aug 29, 2025

• Mypyc ignores custom `__new__` without warning

  #16012 closed Aug 29, 2025

• mypy incorrectly infers callable signature when assigning async function to class attribute

  #19713 closed Aug 29, 2025

• mypy crashes when passing multiple variadic tuples

  #19704 closed Aug 28, 2025

• Regression related type objects and no strict optional

  #19751 closed Aug 28, 2025

• Regression: dict | None or dict fallback breaks type inference for nested dicts after PR #19249

  #19492 closed Aug 28, 2025

• Type-narrowing `Optional[Any]` with generic function returns `<nothing>`

  #12586 closed Aug 28, 2025

• Erroneous "Alternative patterns bind different names" in match statement

  #13950 closed Aug 27, 2025

• mypy gives diagnostic on code Literal typing code accepted by pyright, pyrefly

  #19747 closed Aug 27, 2025

• invalid keyword argument

  #19746 closed Aug 27, 2025

• Match statement parameter binding fails for subclass of generic class

  #19442 closed Aug 27, 2025

• Wrong types when pattern matching `int` with `http.HTTPStatus`

  #18866 closed Aug 27, 2025

• Type inference issue with match expression in generic functions

  #15930 closed Aug 27, 2025

• Cannot use `match case` to destructure any object using `case object(x=y)`

  #16912 closed Aug 27, 2025

• TypedDict overlap check has non-deterministic output

  #19745 closed Aug 27, 2025

• Odd behavior in DEV version of mypy on `pandas-stubs`

  #19711 closed Aug 26, 2025

• RTD docs build has been failing since Aug 2 2025

  #19726 closed Aug 25, 2025

12 Issues opened by 9 people

• 1.18 Release Planing

  #19764 opened Aug 29, 2025

• Inconsistent processing Literal as TypeVar

  #19761 opened Aug 29, 2025

• Incorrect argument names for dataclass with "private" (mangled) members

  #19755 opened Aug 29, 2025

• Type narrowing an enum shouldn't narrow to a literal

  #19753 opened Aug 28, 2025

• Incremental improvements to the fixed format serialization

  #19738 opened Aug 26, 2025

• stubtest: don't enforce `@disjoint_base` by default until PEP 800 is accepted

  #19737 opened Aug 26, 2025

• stubtest: incorrect runtime signature of cython `__cinit__` methods

  #19732 opened Aug 25, 2025

• `dataclass_transform` decorator not detected when using alias

  #19731 opened Aug 25, 2025

• Clarify + validate python_version

  #19729 opened Aug 25, 2025

• redundant-expr does not catch always-True `if`

  #19728 opened Aug 25, 2025

• Incorrect str-format error for bytes interpolation when `__bytes__` method exists

  #19724 opened Aug 25, 2025

• Incorrect error for unions syntax in comments and strings (Python 3.9)

  #19722 opened Aug 24, 2025

25 Unresolved conversations

Sometimes conversations happen on old items that aren’t yet closed. Here is a list of all the Issues and Pull Requests with unresolved conversations.

• Fix spurious possibly-undefined errors in for-else with break

  #19696 commented on Aug 26, 2025 • 2 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Aug 29, 2025 • 2 new comments

• [mypyc] feat: true_dict_rprimitive for optimized dict fastpath usage

  #19499 commented on Aug 25, 2025 • 1 new comment

• Support error codes from plugins in options

  #19719 commented on Aug 24, 2025 • 0 new comments

• [mypyc] feat: remove redundant box/unbox operations

  #19717 commented on Aug 26, 2025 • 0 new comments

• [mypyc] feat: exact_dict_rprimitive

  #19677 commented on Aug 27, 2025 • 0 new comments

• [mypyc] feat: new primitive for `int.to_bytes`

  #19674 commented on Aug 29, 2025 • 0 new comments

• [mypyc] feat: new primitive for `int.bit_length`

  #19673 commented on Aug 27, 2025 • 0 new comments

• [mypyc] feat: new primitives for `bytes.rjust` and `bytes.ljust`

  #19672 commented on Aug 26, 2025 • 0 new comments

• Better support for `SomeEnum.item == some_literal`

  #19594 commented on Aug 29, 2025 • 0 new comments

• feat(test): mypyc tests for container creation from `range`

  #19511 commented on Aug 26, 2025 • 0 new comments

• [mypyc] feat: cache len for container creation from expressions with length known at compile time

  #19503 commented on Aug 30, 2025 • 0 new comments

• When selecting an overload item for constraint template matching, treat any ParamSpec in the template as free

  #19487 commented on Aug 28, 2025 • 0 new comments

• Apply union expansion when checking ops involving typevars

  #19455 commented on Aug 28, 2025 • 0 new comments

• Remove support for JSON serialization format

  #19697 commented on Aug 30, 2025 • 0 new comments

• `--enable-error-code unreachable` does not enable unreachability analysis, yet neither is it reported as an invalid error code (etc)

  #19604 commented on Aug 30, 2025 • 0 new comments

• dmypy Suggest assertion error in `bind_function_type_variables`

  #16708 commented on Aug 30, 2025 • 0 new comments

• Incorrect mapping of actual to formal arguments.

  #19692 commented on Aug 30, 2025 • 0 new comments

• Mypy misunderstands class-level namespace (spurious `Variable "module.Class.attribute" is not valid as a type`)

  #12570 commented on Aug 28, 2025 • 0 new comments

• setting `exclude_gitignore = true` breaks stubtest

  #19281 commented on Aug 28, 2025 • 0 new comments

• Different branch of match statement mix type information about similar named variables

  #12650 commented on Aug 27, 2025 • 0 new comments

• Type narrowing on object attribute with match statement doesn't apply

  #14911 commented on Aug 27, 2025 • 0 new comments

• Lazily process installed packages

  #17924 commented on Aug 25, 2025 • 0 new comments

• stubgen and Cython modules

  #7542 commented on Aug 25, 2025 • 0 new comments

• `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`

  #16684 commented on Aug 24, 2025 • 0 new comments