105 Pull requests merged by 17 people

• Add await to empty context hack

  #19777 merged Sep 2, 2025

• [mypyc] Fix object finalization

  #19749 merged Sep 2, 2025

• Consider non-empty enums assignable to Self

  #19779 merged Sep 2, 2025

• [mypyc] Allow defining a single-item free "list" for a native class

  #19785 merged Sep 2, 2025

• Use dedicated tags for most common instances

  #19762 merged Sep 1, 2025

• [mypyc] Speed up unary "not"

  #19774 merged Sep 1, 2025

• [mypyc] Fix C function signature

  #19773 merged Sep 1, 2025

• Mypy micro-optimizations (batch 3/3)

  #19770 merged Sep 1, 2025

• Sync typeshed

  #19772 merged Sep 1, 2025

• Use empty context as fallback for return statements

  #19767 merged Sep 1, 2025

• Update stubinfo for latest typeshed

  #19771 merged Aug 31, 2025

• Mypy micro-optimizations (batch 2/3)

  #19769 merged Aug 31, 2025

• Mypy micro-optimizations (batch 1/3)

  #19768 merged Aug 31, 2025

• Use fast Python wrappers in native_internal

  #19765 merged Aug 31, 2025

• 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

• 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

• 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

• Reset to previous statement when leaving return in semanal

  #19642 merged Aug 14, 2025

• Include ambiguous into UninhabitedType identity

  #19648 merged Aug 14, 2025

• [mypyc] feat: exact_dict_set_item_op

  #19657 merged Aug 14, 2025

• chore: homogenize TypeGuard usage in rtypes.py

  #19655 merged Aug 14, 2025

• [mypyc] feat: cache len for iterating over immutable types

  #19656 merged Aug 14, 2025

• [mypyc] feat: stararg fastpath when calling fn(*args) with tuple

  #19623 merged Aug 13, 2025

• [mypyc] Include more operations in the trace log

  #19647 merged Aug 13, 2025

• [mypyc] Fix remaining failing test on free-threaded builds

  #19646 merged Aug 13, 2025

• Special-case enum method calls

  #19634 merged Aug 12, 2025

• Another two micro-optimizations

  #19633 merged Aug 11, 2025

• [mypyc] Add prefix to attributes of generator classes

  #19535 merged Aug 11, 2025

• PEP 702 (@deprecated): handle "combined" overloads

  #19626 merged Aug 10, 2025

• [mypyc] Fix seg fault due to heap type objects with static tp_doc

  #19636 merged Aug 10, 2025

• Two more micro-optimizations

  #19627 merged Aug 9, 2025

• Cache common instances

  #19621 merged Aug 9, 2025

• Further fix overload diagnostic for vararg and varkwarg

  #19619 merged Aug 9, 2025

• [mypyc] Provide instructions for resolving missing test module on Windows

  #19579 merged Aug 9, 2025

• Fix crash on settable property alias

  #19615 merged Aug 8, 2025

• PEP 702 (@deprecated): consider overloads in snapshot descriptions

  #19613 merged Aug 8, 2025

• Fix overload diagnostic when vararg and varkwarg can match

  #19614 merged Aug 8, 2025

• Fix TypeGuard with call on temporary object

  #19577 merged Aug 8, 2025

• Fix #19491, crash when using enable_error_code value of wrong type in pyproject.toml

  #19494 merged Aug 8, 2025

• Assorted niche optimizations

  #19587 merged Aug 5, 2025

• Move Windows tests from oldest to newest version

  #19545 merged Aug 5, 2025

• Skip more method bodies in third-party libraries

  #19586 merged Aug 5, 2025

• Fix dict assignment to a wider context containing an incompatible typeddict of the same shape

  #19592 merged Aug 5, 2025

• [mypyc] Fix async mypyc tests on Windows

  #19578 merged Aug 4, 2025

• Fix --package-root tests for Windows and Python 3.13+

  #19583 merged Aug 4, 2025

• Sync typeshed

  #19585 merged Aug 4, 2025

• Do not use dictionary in CallableType

  #19580 merged Aug 4, 2025

• Remove --new-type-inference flag

  #19570 merged Aug 4, 2025

• Recognize buffer protocol special methods

  #19581 merged Aug 4, 2025

• Introduce temporary named expressions for match subjects

  #18446 merged Aug 3, 2025

• [mypyc] feat: unwrap NewType types to their base types for optimized code paths

  #19497 merged Aug 3, 2025

• Interpret bare ClassVar as inferred, not Any

  #19573 merged Aug 3, 2025

• Support attribute access on enum members correctly

  #19422 merged Aug 3, 2025

• Follow-up after #19025: test and cleanup

  #19294 merged Aug 3, 2025

• Check slots assignments on self types

  #19332 merged Aug 3, 2025

• [docs] Update common_issues.rst: update information about reveal type & locals

  #19059 merged Aug 2, 2025

• Fix a bug where inline configurations of error codes would lose their values if accompanied by another inline configuration.

  #19075 merged Aug 2, 2025

• Mention in the Any documentation how object is preferable

  #19103 merged Aug 2, 2025

35 Pull requests opened by 17 people

• [mypyc] feat: optimize C code for str.count

  #19582 opened Aug 4, 2025

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

  #19593 opened Aug 4, 2025

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

  #19594 opened Aug 4, 2025

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

  #19596 opened Aug 5, 2025

• Fix matching against union of tuples

  #19600 opened Aug 6, 2025

• Fix `meet_types` for literal and instance

  #19605 opened Aug 7, 2025

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

  #19606 opened Aug 7, 2025

• feat: proper narrowing for TypedDict keys and values

  #19610 opened Aug 7, 2025

• Make IntEnum/StrEnum values passable to functions expecting literal ints or strs

  #19617 opened Aug 8, 2025

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

  #19635 opened Aug 10, 2025

• Remove the Anys from mypy/config_parser.py

  #19637 opened Aug 10, 2025

• [refactor] increase consistency in stdout and stderr optional arguments

  #19638 opened Aug 10, 2025

• Special case TypedDict.get

  #19639 opened Aug 11, 2025

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

  #19643 opened Aug 12, 2025

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

  #19649 opened Aug 12, 2025

• Fix inference when unpacking union type

  #19650 opened Aug 12, 2025

• Rework starargs with union argument

  #19651 opened Aug 13, 2025

• Always try to report missing protocol members

  #19653 opened Aug 13, 2025

• [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

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

  #19696 opened Aug 20, 2025

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

  #19717 opened Aug 23, 2025

• Support error codes from plugins in options

  #19719 opened Aug 23, 2025

• 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

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

  #19760 opened Aug 29, 2025

• Sync variance of typing classes in fixtures with typeshed

  #19778 opened Sep 1, 2025

• fix: Allow instantiation of type[None] in analyze_type_type_callee

  #19782 opened Sep 2, 2025

76 Issues closed by 14 people

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

  #19716 closed Sep 2, 2025

• `Self` type isn't considered to be the same as the explicit class type

  #16558 closed Sep 2, 2025

• Unable to use `typing.Self` with `Enum`s

  #18345 closed Sep 2, 2025

• `comparision-overlap` ignores side-effects from member function calls

  #19783 closed Sep 2, 2025

• mypy-lang.org roadmap link is dead

  #19784 closed Sep 2, 2025

• Async generators are detected as synchronous generators erroneously

  #17482 closed Sep 2, 2025

• Overload + generic functions + union arguments = inconsistent results (wrong overload is matched?)

  #18321 closed Sep 2, 2025

• Not identifying None check on multiple values using "any" or "all"

  #19775 closed Sep 1, 2025

• False positive when using coroutines and generics

  #15886 closed Sep 1, 2025

• mypy incorrectly tags function argument TypeVar with return type when called from a caller with the same signature

  #16924 closed Sep 1, 2025

• Inspection fails on second-order circular imports for dataclasses

  #10200 closed Aug 31, 2025

• 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

• 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

• `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

• `name-defined` is whitespace-dependent

  #19632 closed Aug 14, 2025

• Mypy thinks `dict[Never, Never]` is a subtype of `Mapping[str, object]`

  #19641 closed Aug 14, 2025

• Mypy configuration is incomplete

  #19429 closed Aug 9, 2025

• `__new__` return types are not respected (reported as error and overwritten by the current class) unless the return type is a subclass of the current class

  #19624 closed Aug 9, 2025

• MyPy does not recognize methods as `MethodType`, only as `Callable`

  #19620 closed Aug 9, 2025

• Mypy crash on master with property alias with setters

  #19572 closed Aug 8, 2025

• False positive on overload implementation does not accept all possible arguments with varargs

  #19612 closed Aug 8, 2025

• Incorrect handling of overloads with `defaultdict` and `MutableMapping`

  #19525 closed Aug 8, 2025

• TypeGuard/TypeIs broken on __call__ with fresh class

  #19575 closed Aug 8, 2025

• Crash when using an invalid 'enable_error_code' value in pyproject.toml

  #19491 closed Aug 8, 2025

• Overloaded deprecated __init__ method use is not reported

  #19588 closed Aug 5, 2025

• Unexpected error when assigning dict literal to union containing TypedDict

  #19590 closed Aug 5, 2025

• Upcasting causes incompatible types in assignment with `TypedDict`

  #14991 closed Aug 5, 2025

• Exhaustive checks with `assert_never` when using `match` on a 2-tuple fails

  #16650 closed Aug 3, 2025

• match narrowing fails when the operand is an `await` expression

  #17230 closed Aug 3, 2025

• Type narrowing broken with dict items

  #18440 closed Aug 3, 2025

• 1.16 Release Planning

  #18739 closed Aug 3, 2025

• 1.15 Release Tracking Issue

  #18487 closed Aug 3, 2025

• [CI]: `mypy-primer(0)` timeout due to long checking of `colour`

  #19403 closed Aug 3, 2025

• Bare ClassVar should infer type instead of defaulting to Any

  #5587 closed Aug 3, 2025

• Exhaustiveness checking false positives when using `match self` or `match self.value` inside an Enum

  #15186 closed Aug 3, 2025

• Enum instance type ignored in match/case statements

  #13841 closed Aug 3, 2025

• Faulty type inference for `Enum` attributes

  #15454 closed Aug 3, 2025

• Type of an Enum nonmember is wrong when accessed through a member

  #19418 closed Aug 3, 2025

• False positive for "Non-overlapping identity check" when comparing Enum variants

  #10910 closed Aug 3, 2025

• Enum elements accessed via 'self' have 'auto' type

  #12107 closed Aug 3, 2025

• Enum items are mistyped

  #11368 closed Aug 3, 2025

• TypeVar with union bound changes return type of `type(t)()`

  #18478 closed Aug 3, 2025

• Slots not checked if `Self` annotation is present

  #19331 closed Aug 3, 2025

• (🐞) Invalid per-module options in inline configuration are silently ignored

  #12342 closed Aug 2, 2025

51 Issues opened by 33 people

• Drop support for 32-bit platforms?

  #19786 opened Sep 2, 2025

• Faster parser

  #19776 opened Sep 1, 2025

• 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

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

  #19706 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

• Cannot instantiate type "Type[None]"

  #19660 opened Aug 14, 2025

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

  #19659 opened Aug 14, 2025

• `NamedTuple` parametrized with a `ParamSpec` can't be used as an annotation

  #19658 opened Aug 14, 2025

• Unclear when Join is picked vs Union in upcast operation.

  #19652 opened Aug 13, 2025

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

  #19644 opened Aug 12, 2025

• Type alias and union wrong revealed type

  #19640 opened Aug 11, 2025

• Specify behavior for `Literal?` types.

  #19625 opened Aug 9, 2025

• Severe performance degradation with lots of constrained type variables in a generic class

  #19622 opened Aug 9, 2025

• unexpected "var-annotated" when using constrained TypeVar

  #19618 opened Aug 8, 2025

• MyIntEnum.ONE should be passable to functions expecting Literal[1] arguments

  #19616 opened Aug 8, 2025

• Wrong inference for `abs/__abs__` or function that calls a method on a generic type.

  #19609 opened Aug 7, 2025

• TypeGuard behavior does not match python semantics in async functions

  #19608 opened Aug 7, 2025

• `Final` nested inside `ClassVar` results in `Any`

  #19607 opened Aug 7, 2025

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

  #19604 opened Aug 7, 2025

• Complete bi-directional linking between cli-flags/configs and error codes

  #19603 opened Aug 7, 2025

• Configuration file entries for stubgen

  #19602 opened Aug 7, 2025

• Forward-referencing type application with type variable in a value expression in stubs emits confusing error

  #19601 opened Aug 6, 2025

• Matching tuple against union merges field types

  #19599 opened Aug 6, 2025

• private (name mangled) attributes within inherited classes can not have different types

  #19598 opened Aug 6, 2025

• Should there be a mypy-path command-line flag?

  #19597 opened Aug 6, 2025

• Consider an `__eq__` that always raises as non-overlapping for equality purposes?

  #19595 opened Aug 5, 2025

• Self type is not expanded correctly when accessed on a type variable with union bound

  #19584 opened Aug 4, 2025

• `comparison-overlap` triggers for string enum members when the member name isn't the same as the comparison value

  #19576 opened Aug 3, 2025

98 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: true_dict_rprimitive for optimized dict fastpath usage

  #19499 commented on Aug 25, 2025 • 12 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Sep 2, 2025 • 10 new comments

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

  #19511 commented on Aug 26, 2025 • 7 new comments

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

  #19503 commented on Aug 30, 2025 • 6 new comments

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

  #19145 commented on Aug 23, 2025 • 2 new comments

• Improve match statement union narrowing/inference

  #17600 commented on Aug 3, 2025 • 2 new comments

• feat(mypyc): proper weakref support

  #19056 commented on Aug 7, 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

• Patch `check_op_reversible` to support `tuple` subclasses.

  #19046 commented on Aug 4, 2025 • 0 new comments

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

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

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

  #18690 commented on Aug 5, 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

• Add special handling for typing.get_args

  #17784 commented on Aug 6, 2025 • 0 new comments

• Add GitHub annotations format for `--output`

  #17771 commented on Aug 5, 2025 • 0 new comments

• Support name mangling

  #16715 commented on Sep 1, 2025 • 0 new comments

• Fix binding difference between callables and callback protocols

  #15993 commented on Aug 31, 2025 • 0 new comments

• Allow any type to be returned by `__new__`

  #14471 commented on Aug 9, 2025 • 0 new comments

• Faster, parallel type checking

  #933 commented on Sep 2, 2025 • 0 new comments

• Crash on diverging recursive generic protocols

  #17326 commented on Sep 2, 2025 • 0 new comments

• False positive - Type narrowing of class attributes

  #17537 commented on Sep 2, 2025 • 0 new comments

• AssertionError: Must not defer during final iteration

  #17716 commented on Sep 2, 2025 • 0 new comments

• Passing self to a generic function that accepts Self

  #17723 commented on Sep 2, 2025 • 0 new comments

• Mypy should allow for Self in parametrized parent class definition — issues with contextlib.AbstractContextManager

  #17758 commented on Sep 2, 2025 • 0 new comments

• Mypyc: Crash when using property deleter

  #17928 commented on Sep 2, 2025 • 0 new comments

• a pretty bad bug report about a segfault, but at least I can show you the repo

  #18195 commented on Sep 2, 2025 • 0 new comments

• [regression] no type checking beyond perceived isinstance guard failure

  #18329 commented on Sep 2, 2025 • 0 new comments

• type of variable not narrowed after `continue` statement inside `try`/`except` block inside a for loop inside a function

  #18466 commented on Sep 2, 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

• refactor `visit_conditional_expr` to fix ternary behavior (option 1)

  #19563 commented on Aug 12, 2025 • 0 new comments

• Update update_data.py: make the space in error comments optional

  #19546 commented on Aug 7, 2025 • 0 new comments

• [wip] [mypyc] feat: quasi-constant folding for DictExpr and TupleExpr

  #19542 commented on Aug 3, 2025 • 0 new comments

• [wip] [mypyc] feat: unroll certain for loops with known params

  #19518 commented on Aug 3, 2025 • 0 new comments

• [match-case] Fix narrowing of class pattern with union-argument.

  #19517 commented on Aug 12, 2025 • 0 new comments

• feat: index-range err code

  #19513 commented on Aug 4, 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

• feat: `__repr__` method for RefExpr and NameExpr

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

• [match-case] fix matching against `typing.Callable` and `Protocol` types.

  #19471 commented on Aug 4, 2025 • 0 new comments

• [PEP 695] Fix incorrect Variance Computation with Polymorphic Methods.

  #19466 commented on Sep 2, 2025 • 0 new comments

• Apply union expansion when checking ops involving typevars

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

• [PEP 696] Fix swapping TypeVars with defaults.

  #19449 commented on Aug 4, 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

• Try to fix problems caused by in-place modification of typevar defaults

  #19382 commented on Aug 8, 2025 • 0 new comments

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

  #19375 commented on Sep 2, 2025 • 0 new comments

• Fix `Enum.value` inference for `Enum`s with `@cache`d methods

  #19374 commented on Sep 2, 2025 • 0 new comments

• Allow TypeVarTuple arguments to subclasses of generic TypedDict

  #19234 commented on Aug 5, 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

• Improve cli help somewhat

  #19073 commented on Aug 3, 2025 • 0 new comments

• generic is incorrectly inferred as invariant if class uses `Self` type on an attribute

  #18334 commented on Sep 2, 2025 • 0 new comments

• Type narrowing for a tuple is worse with match than with the equivalent isinstance check

  #19082 commented on Aug 13, 2025 • 0 new comments

• Type narrowing for dict.get("key") is not None

  #14766 commented on Aug 11, 2025 • 0 new comments

• Support a method of copying function signature

  #10574 commented on Aug 10, 2025 • 0 new comments

• Announcement issue for plugin API changes

  #6617 commented on Aug 9, 2025 • 0 new comments

• `meet_types` gives unexpected results when meeting literal and Instance

  #19560 commented on Aug 9, 2025 • 0 new comments

• Internal error: De-serialization failure: `TypeInfo` not fixed

  #18087 commented on Aug 8, 2025 • 0 new comments

• segfault on recursive generic function class

  #18219 commented on Aug 8, 2025 • 0 new comments

• For tuple in match, _ isn't determined to be Never, but _, _ is

  #18792 commented on Aug 8, 2025 • 0 new comments

• Run without module detection logic

  #10428 commented on Aug 7, 2025 • 0 new comments

• join is not always symmetric

  #19551 commented on Aug 7, 2025 • 0 new comments

• Mypyc should support `__file__`

  #17795 commented on Aug 7, 2025 • 0 new comments

• --strict does not include all mypy checks

  #14143 commented on Aug 7, 2025 • 0 new comments

• Include binary wheels for ARM Windows

  #18593 commented on Aug 6, 2025 • 0 new comments

• Importing IPython confuses mypy about package '__main__.py'

  #19500 commented on Aug 5, 2025 • 0 new comments

• IntEnum literals are not considerable comparable with ints

  #16327 commented on Aug 5, 2025 • 0 new comments

• dmypy crash

  #18755 commented on Aug 5, 2025 • 0 new comments

• mypy reports no issues on access of conditionally available fields

  #18708 commented on Aug 4, 2025 • 0 new comments

• [regression] Type narrowing for through `not issubclass(…)` broken for union of TypeVar instance / types in 1.17

  #19529 commented on Aug 4, 2025 • 0 new comments

• mypy infer incorrect types in frozen dataclass with descriptors as attributes.

  #17601 commented on Aug 4, 2025 • 0 new comments

• Meta issue tracker, pt 2

  #16472 commented on Aug 3, 2025 • 0 new comments

• Improve precision of mypy performance tracking

  #14358 commented on Aug 3, 2025 • 0 new comments

• Mypy/dmypy takes over 16GB of memory

  #17105 commented on Aug 3, 2025 • 0 new comments

• Unexpected order dependence when assigning to multiple targets

  #19553 commented on Aug 3, 2025 • 0 new comments

• Crash when type variable has same name as an external symbol with an erroneous definition in PEP 695 generic class

  #19526 commented on Aug 3, 2025 • 0 new comments

• Dataclasses: `No overload variant of "asdict" matches argument type "Self" [call-overload]` when deciding decorator conditionally

  #17242 commented on Aug 31, 2025 • 0 new comments

• Code review request: support for asdict returning TypedDict

  #10104 commented on Aug 31, 2025 • 0 new comments

• dmypy Suggest assertion error in `bind_function_type_variables`

  #16708 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

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

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

• ABCMeta.register support

  #2922 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

• mypy is slow when type checking torch

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

• [stubtest] Check `__slots__` better

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

• Covariance is not inferred for NamedTuple and frozen Dataclasses

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

• Faster cache deserialization

  #3456 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

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

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

• functools.partialmethod not supported properly?

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

• Type narrowing when list variable is reassigned

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

• mypy rejects unpacking into same variable

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

• Can't call get on an empty dict

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

• Unable to specify a default value for a generic parameter

  #3737 commented on Aug 13, 2025 • 0 new comments