19 Pull requests merged by 8 people

• 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

• Sync typeshed

  #19664 merged Aug 16, 2025

• Sort arguments in TypedDict overlap error message

  #19666 merged Aug 15, 2025

• [mypyc] Remove unreachable code

  #19667 merged Aug 15, 2025

• [mypyc] feat: optimize f-string building from Final values

  #19611 merged Aug 15, 2025

• fix: prevent false positive "untyped after decorator transformation" after deferral

  #19591 merged Aug 15, 2025

13 Pull requests opened by 7 people

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

  #19672 opened Aug 16, 2025

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

  #19673 opened Aug 16, 2025

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

  #19674 opened Aug 16, 2025

• [testing]

  #19676 opened Aug 17, 2025

• [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

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

  #19707 opened Aug 21, 2025

• Remove unnecessary error message for match class patterns

  #19708 opened Aug 21, 2025

• Omit errors for class pattern matches against object

  #19709 opened Aug 21, 2025

• Use union for captured vars in or pattern

  #19710 opened Aug 21, 2025

9 Issues closed by 5 people

• 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

• `a: Type[T]` does not accept parameter of type `TypeAliasType`

  #19661 closed Aug 15, 2025

• tuple expression gives different result than equivalent `TypeVarTuple` usage.

  #19665 closed Aug 15, 2025

• function untyped after decorator transformation

  #19589 closed Aug 15, 2025

16 Issues opened by 12 people

• 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

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

  #19675 opened Aug 17, 2025

• Type-narrowing based on instance type

  #19671 opened Aug 15, 2025

• Make enums idempotent

  #19669 opened Aug 15, 2025

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

  #19663 opened Aug 15, 2025

• `mypy` fails to correctly understand some iterable type in `*args`

  #19662 opened Aug 15, 2025

40 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.

• Rework starargs with union argument

  #19651 commented on Aug 19, 2025 • 32 new comments

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

  #19649 commented on Aug 20, 2025 • 11 new comments

• [mypyc] feat: ForFilter generator helper for `builtins.filter`

  #19643 commented on Aug 16, 2025 • 11 new comments

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

  #19511 commented on Aug 20, 2025 • 7 new comments

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

  #19503 commented on Aug 21, 2025 • 5 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Aug 18, 2025 • 3 new comments

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

  #19499 commented on Aug 18, 2025 • 2 new comments

• [refactor] Remove code that "disables deprecation warnings about \u"

  #19606 commented on Aug 16, 2025 • 1 new comment

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

  #19145 commented on Aug 20, 2025 • 1 new comment

• [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 21, 2025 • 0 new comments

• Special case TypedDict.get

  #19639 commented on Aug 15, 2025 • 0 new comments

• feat: `__repr__` method for RefExpr and NameExpr

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

• Add functools.lru_cache plugin support Fixes #16261

  #19432 commented on Aug 17, 2025 • 0 new comments

• Draft: Solve intermediate variable bug

  #19399 commented on Aug 16, 2025 • 0 new comments

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

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

• Fix inference when unpacking union type

  #19650 commented on Aug 15, 2025 • 0 new comments

• Handle `__hash__ = None` in somewhat more intuitive fashion

  #19168 commented on Aug 15, 2025 • 0 new comments

• Fix/attrs init overload

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

• Enable warn_unreachable = True for `mypyc` and all other files as well

  #19050 commented on Aug 15, 2025 • 0 new comments

• Cannot instantiate type "Type[None]"

  #19660 commented on Aug 15, 2025 • 0 new comments

• Mypy fails to solve `tuple[int, *Ts, int]` as an `Iterable[T]`.

  #19659 commented on Aug 15, 2025 • 0 new comments

• mypy daemon consumes an increasing amount of memory every time `run` or `recheck` is invoked

  #19644 commented on Aug 15, 2025 • 0 new comments

• Can't call get on an empty dict

  #17684 commented on Aug 16, 2025 • 0 new comments

• mypy rejects unpacking into same variable

  #14786 commented on Aug 16, 2025 • 0 new comments

• Type narrowing when list variable is reassigned

  #19528 commented on Aug 17, 2025 • 0 new comments

• functools.partialmethod not supported properly?

  #8619 commented on Aug 17, 2025 • 0 new comments

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

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

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

  #14600 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

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

  #19492 commented on Aug 21, 2025 • 0 new comments

• ABCMeta.register support

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

• Support name mangling

  #16715 commented on Aug 16, 2025 • 0 new comments

• Consider property access from class objects (now for real)

  #18969 commented on Aug 15, 2025 • 0 new comments