21 Pull requests merged by 9 people

• More detailed checking of type objects in stubtest

  #18251 merged Aug 23, 2025

• Remove unnecessary error message for match class patterns

  #19708 merged Aug 23, 2025

• stubtest: handle overloads with mixed pos-only params

  #18287 merged Aug 23, 2025

• Somewhat better support for isinstance on old-style unions

  #19714 merged Aug 23, 2025

• Use union for captured vars in or pattern

  #19710 merged Aug 22, 2025

• stubtest: flag redundant @disjoint_base decorators

  #19715 merged Aug 22, 2025

• stubtest: correct "argument" → "parameter" terminology in error messages

  #19707 merged Aug 22, 2025

• stubtest: get better signatures for __init__ of C classes

  #18259 merged Aug 21, 2025

• stubtest: do not require @disjoint_base if there are __slots__

  #19701 merged Aug 21, 2025

• [mypyc] feat: extend stararg fastpath from #19629 with star2 fastpath

  #19630 merged Aug 21, 2025

• Fail gracefully on unsupported template strings (PEP 750)

  #19700 merged Aug 21, 2025

• Don't expand PEP 695 aliases when checking node fullnames

  #19699 merged Aug 20, 2025

• More efficient (fixed-format) serialization

  #19668 merged Aug 19, 2025

• Implement PEP 800 (@disjoint_base)

  #19678 merged Aug 19, 2025

• [mypyc] Optimize type(x) and x.__class__

  #19691 merged Aug 19, 2025

• [mypyc] Specialize bytes.decode calls with common encodings

  #19688 merged Aug 19, 2025

• Force all deserialized objects to the oldest GC generation

  #19681 merged Aug 19, 2025

• [mypyc] feat: extend stararg fastpath from #19623 to handle lists and generic sequences

  #19629 merged Aug 18, 2025

• [mypyc] Add primitive for <type>.__name__

  #19683 merged Aug 18, 2025

• [mypyc] Speed up "in" against final fixed-length tuple

  #19682 merged Aug 18, 2025

• [mypyc] Refactor building IR for "in" against a tuple

  #19679 merged Aug 18, 2025

11 Pull requests opened by 7 people

• [mypyc] feat: exact_dict_rprimitive

  #19677 opened Aug 18, 2025

• Sync enum members logic in typeanal and checkmember

  #19687 opened Aug 19, 2025

• Handle more cases in `any_constraints`

  #19695 opened Aug 20, 2025

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

  #19696 opened Aug 20, 2025

• fix crash with variadic tuple arguments to generic type

  #19705 opened Aug 21, 2025

• Omit errors for class pattern matches against object

  #19709 opened Aug 21, 2025

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

  #19717 opened Aug 23, 2025

• `--strict-equality` for `None`

  #19718 opened Aug 23, 2025

• Support error codes from plugins in options

  #19719 opened Aug 23, 2025

• Update dependencies

  #19720 opened Aug 24, 2025

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

  #19721 opened Aug 24, 2025

10 Issues closed by 4 people

• stubtest treats constructors of native types as `(self, *args, **kwargs)`.

  #17672 closed Aug 24, 2025

• stubtest mishandles overloads where param is pos-only in one overload

  #17023 closed Aug 23, 2025

• Support typing.Union/typing.Optional in isinstance check (/support old-style unions)

  #17680 closed Aug 23, 2025

• stubtest nit: arguments vs. parameters

  #16508 closed Aug 22, 2025

• Type statement inside class scope not able to reference class generics

  #19373 closed Aug 21, 2025

• mypy does not error when calling a `TypeAliasType`, if it refers to `dict`

  #19698 closed Aug 20, 2025

• new generics should be inferred as covariant instead of invariant on frozen dataclasses

  #17692 closed Aug 20, 2025

• Subtype of mapping is not compatible type in `.update()` method

  #10970 closed Aug 19, 2025

• Bug Report: Inconsistent Mypy Return Type Checking Across Identical Python/Mypy Environments Due to Build/Dependency Variations

  #19680 closed Aug 19, 2025

• Type narrowing fails with isinstance(self, Protocol) when result is stored in a variable

  #19684 closed Aug 18, 2025

14 Issues opened by 13 people

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

  #19722 opened Aug 24, 2025

• Spurious type error with async function + generic callable argument + optional return type

  #19716 opened Aug 23, 2025

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

  #19713 opened Aug 22, 2025

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

  #19711 opened Aug 21, 2025

• Type aliases inside dataclass definitions are not supported at runtime inside of if TYPE_CHECKING

  #19706 opened Aug 21, 2025

• mypy crashes when passing multiple variadic tuples

  #19704 opened Aug 21, 2025

• MyPy infers descriptors are always ClassVars when testing assignability to protocols

  #19702 opened Aug 21, 2025

• Remove support for JSON serialization format

  #19697 opened Aug 20, 2025

• `dataclasses.replace` should be able to return differently-parametrized generic dataclasses

  #19694 opened Aug 19, 2025

• Implement a check when float-only operations are used

  #19693 opened Aug 19, 2025

• Incorrect mapping of actual to formal arguments.

  #19692 opened Aug 19, 2025

• `try: except: continue` inside `for: else:` causes spurious used-before-def

  #19690 opened Aug 19, 2025

• stubtest crashes on class decorator in overloaded function

  #19689 opened Aug 19, 2025

• mypy incorrectly infers type of ClassVar when accessed in try/except AttributeError

  #19686 opened Aug 19, 2025

37 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.

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

  #19674 commented on Aug 23, 2025 • 11 new comments

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

  #19673 commented on Aug 23, 2025 • 7 new comments

• Rework starargs with union argument

  #19651 commented on Aug 19, 2025 • 7 new comments

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

  #19503 commented on Aug 23, 2025 • 3 new comments

• [mypyc] feat: ForMap generator helper for `builtins.map`

  #19649 commented on Aug 20, 2025 • 2 new comments

• WIP: new mypyc primitive for `weakref.ref.__call__`

  #19145 commented on Aug 23, 2025 • 1 new comment

• 'Subclass of "A" and "B" cannot exist: would have incompatible method signatures' is usually wrong

  #19377 commented on Aug 18, 2025 • 0 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Aug 18, 2025 • 0 new comments

• [mypyc] Implement `str.lower()` and `str.upper()` primitive

  #19375 commented on Aug 21, 2025 • 0 new comments

• feat: `__repr__` method for RefExpr and NameExpr

  #19486 commented on Aug 21, 2025 • 0 new comments

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

  #19499 commented on Aug 18, 2025 • 0 new comments

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

  #19511 commented on Aug 20, 2025 • 0 new comments

• [stubtest] Check runtime availability of private types not marked `@type_check_only`

  #19574 commented on Aug 23, 2025 • 0 new comments

• [stubtest] Improve checking of positional-only parameters in dunder methods

  #19593 commented on Aug 23, 2025 • 0 new comments

• [PEP 747] Recognize TypeForm[T] type and values (#9773)

  #19596 commented on Aug 21, 2025 • 0 new comments

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

  #19631 commented on Aug 24, 2025 • 0 new comments

• Fix `--strict-equality` for iteratively visited code

  #19635 commented on Aug 23, 2025 • 0 new comments

• [mypyc] feat: `__mypyc_empty_tuple__` constant

  #19654 commented on Aug 23, 2025 • 0 new comments

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

  #19672 commented on Aug 23, 2025 • 0 new comments

• Uncaught Error in Assignment of type Iterator[int] to type Iterator[str]

  #19675 commented on Aug 18, 2025 • 0 new comments

• `mypy` doesn't understand that `*args: P.args` implies that `args` is a `tuple`

  #19663 commented on Aug 19, 2025 • 0 new comments

• Non-`Enum` base class variables are interpreted as `Enum` instances

  #14600 commented on Aug 19, 2025 • 0 new comments

• Make enums idempotent

  #19669 commented on Aug 19, 2025 • 0 new comments

• Faster cache deserialization

  #3456 commented on Aug 19, 2025 • 0 new comments

• Covariance is not inferred for NamedTuple and frozen Dataclasses

  #17623 commented on Aug 20, 2025 • 0 new comments

• [stubtest] Check `__slots__` better

  #13906 commented on Aug 21, 2025 • 0 new comments

• Match statement parameter binding fails for subclass of generic class

  #19442 commented on Aug 21, 2025 • 0 new comments

• mypy is slow when type checking torch

  #17919 commented on Aug 21, 2025 • 0 new comments

• Lazily process installed packages

  #17924 commented on Aug 21, 2025 • 0 new comments

• Internal error: KeyError 'setter_type' during node deserialization

  #19359 commented on Aug 21, 2025 • 0 new comments

• ABCMeta.register support

  #2922 commented on Aug 21, 2025 • 0 new comments

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

  #19492 commented on Aug 22, 2025 • 0 new comments

• Type alias over generic parameter in generic class produces an error

  #17956 commented on Aug 22, 2025 • 0 new comments

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

  #18386 commented on Aug 23, 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

• Defer type analysis of integer Literal when builtins.int is slow to resolve

  #18046 commented on Aug 23, 2025 • 0 new comments

• Fix/attrs init overload

  #19104 commented on Aug 19, 2025 • 0 new comments