34 Pull requests merged by 10 people

• 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

• [docs] Update common_issues.rst: mention orjson in the Mypy slow section

  #19058 merged Aug 2, 2025

• [docs] Include a real listing of the flags strict enables in the online documentation

  #19062 merged Aug 2, 2025

• [stubtest] Allow runtime-existing aliases of types marked as @type_check_only

  #19568 merged Aug 2, 2025

• Add stubtest test for property aliases

  #19567 merged Aug 2, 2025

• Add internal flag to disable expression cache

  #19569 merged Aug 2, 2025

• Update crash issue template to use syntax highlighting in code blocks

  #19527 merged Aug 2, 2025

• Optimize bind_self() and deprecation checks

  #19556 merged Aug 2, 2025

• fix: prevent crash on dataclass with PEP695 TypeVarTuple on py3.13

  #19565 merged Aug 2, 2025

• Keep trivial instances and aliases during expansion

  #19543 merged Aug 1, 2025

• feat: new mypyc primitive for weakref.ref

  #19099 merged Jul 31, 2025

• Explicitly check case‐sensitivity of file system for tests

  #19540 merged Jul 31, 2025

• Update changelog for 1.17.1

  #19550 merged Jul 31, 2025

• Update test requirements

  #19539 merged Jul 30, 2025

• [mypyc] Enable free threading when compiling multiple modules

  #19541 merged Jul 30, 2025

• [mypyc] Make type objects immortal if using free threading

  #19538 merged Jul 30, 2025

• Use cache for DictExpr as well

  #19536 merged Jul 30, 2025

• Use cache for OpExpr

  #19523 merged Jul 29, 2025

• perf: deduplicate fast_container_type and fast_dict_type items before joining

  #19409 merged Jul 29, 2025

• Move self argument checks to a later phase - after decorator application, if any

  #19490 merged Jul 28, 2025

• Try simple-minded call expression cache

  #19505 merged Jul 28, 2025

• [mypyc] Fix list.pop primitive on free-threaded builds

  #19522 merged Jul 28, 2025

• [mypyc] Only generate an export table if using separate compilation

  #19521 merged Jul 28, 2025

• Various minor docstring and comment updates

  #19519 merged Jul 28, 2025

15 Pull requests opened by 8 people

• [mypyc] Add prefix to attributes of generator classes

  #19535 opened Jul 29, 2025

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

  #19542 opened Jul 30, 2025

• Move Windows tests from oldest to newest version

  #19545 opened Jul 30, 2025

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

  #19546 opened Jul 30, 2025

• Document mypy exit codes

  #19549 opened Jul 31, 2025

• Allow skip and xfail to both be applied to test cases

  #19552 opened Jul 31, 2025

• refactor `visit_conditional_expr` to fix ternary behavior (option 2)

  #19562 opened Aug 1, 2025

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

  #19563 opened Aug 1, 2025

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

  #19574 opened Aug 2, 2025

• Fix TypeGuard with call on temporary object

  #19577 opened Aug 3, 2025

• [mypyc] Fix async mypyc tests on Windows

  #19578 opened Aug 3, 2025

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

  #19579 opened Aug 3, 2025

• Do not use dictionary in CallableType

  #19580 opened Aug 3, 2025

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

  #19582 opened Aug 4, 2025

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

  #19583 opened Aug 4, 2025

34 Issues closed by 5 people

• 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

• Should include a real listing of the flags strict enables in the online documentation.

  #19061 closed Aug 2, 2025

• Stubtest thinks a property alias isn't read-only in stubs

  #19509 closed Aug 2, 2025

• Generic dataclass with TypeVarTuple crashes Mypy

  #19559 closed Aug 2, 2025

• mypy error with generics typing and singledispatch

  #19564 closed Aug 2, 2025

• func-returns-value check is overly restrictive and prevents legitimate None-returning functions

  #19555 closed Aug 1, 2025

• crash for a very specific invocation of mypy: `assert isinstance(visitor, SyntheticTypeVisitor)`

  #19286 closed Aug 1, 2025

• 1.15.0 regression: `list.append` false positive with `Signals` enum

  #18628 closed Jul 31, 2025

• [docs] Update Code Conventions to reflect the switch from flake8 to ruff

  #19498 closed Jul 31, 2025

• Wildly inconsistent performance for seemingly trivial changes to source code

  #14271 closed Jul 30, 2025

• Mypy errors out for deeply nested dictionaries

  #14636 closed Jul 30, 2025

• Mypy hangs indefinitely trying to analyse a file with huge nested dicts

  #14970 closed Jul 30, 2025

• Pathological performance on big list and dict literals

  #8247 closed Jul 30, 2025

• Mypy stuck with polynomial using NumPy

  #14978 closed Jul 29, 2025

• False positive "Method must have at least one argument" with `@enum.member`

  #18720 closed Jul 28, 2025

• :bug: Methods converted to `staticmethod`s using a decorator not treated as `staticmethod`s

  #13434 closed Jul 28, 2025

• Mypy doesn't recognize `@staticmethod`-like decorator

  #18989 closed Jul 28, 2025

• Erroneous "Self argument missing" error when decorators are used

  #19392 closed Jul 28, 2025

26 Issues opened by 19 people

• Narrowing doesn't work on a typevar when calling a method with Self type

  #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

• TypeGuard/TypeIs broken on __call__ with fresh class

  #19575 opened Aug 2, 2025

• Mypy crash on master with property alias with setters

  #19572 opened Aug 2, 2025

• Type `mypy/config_parser.py` without `Any`

  #19566 opened Aug 2, 2025

• Irregular inference with ternary based on attribute.

  #19561 opened Aug 1, 2025

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

  #19560 opened Aug 1, 2025

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

  #19558 opened Aug 1, 2025

• Mypyc gcc compilation fails with specific duplicate variable definition

  #19557 opened Aug 1, 2025

• Stderr in regular tests should probably go to out as well

  #19554 opened Jul 31, 2025

• Unexpected order dependence when assigning to multiple targets

  #19553 opened Jul 31, 2025

• join is not always permutation invariant

  #19551 opened Jul 31, 2025

• Config errors sometimes result in exit code 0

  #19548 opened Jul 31, 2025

• "# E:" lines (etc) in test files are ignored at the beginning of lines

  #19547 opened Jul 31, 2025

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

  #19537 opened Jul 30, 2025

• Literal list ternary behave unexpected

  #19534 opened Jul 29, 2025

• TypeVarTuple instantiation with the empty tuple in Generic not being recognized as such

  #19533 opened Jul 29, 2025

• Type narrowing of indexing a StrEnum created in a function

  #19532 opened Jul 29, 2025

• ImportError: dynamic module does not define module export function

  #19531 opened Jul 29, 2025

• Type narrowing of `TypeVar` with abstract bases classes causes `[return-value]` error

  #19530 opened Jul 29, 2025

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

  #19529 opened Jul 29, 2025

• No type narrowing when `isinstance` list comprehension is assigned to the same variable

  #19528 opened Jul 29, 2025

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

  #19526 opened Jul 28, 2025

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

  #19525 opened Jul 28, 2025

• Multiple extensions using `get_base_class_hook` interfere with each other

  #19524 opened Jul 28, 2025

• Classmethods as attrs converters

  #19520 opened Jul 28, 2025

39 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 #19491, crash when using enable_error_code value of wrong type in pyproject.toml

  #19494 commented on Aug 3, 2025 • 7 new comments

• Enable pretty by default

  #19510 commented on Jul 31, 2025 • 4 new comments

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

  #19145 commented on Aug 4, 2025 • 2 new comments

• Improve match statement union narrowing/inference

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

• [mypyc] feat: cache len for iterating over immutable types and expressions with length known at compile time

  #19503 commented on Aug 4, 2025 • 1 new comment

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

  #19499 commented on Aug 4, 2025 • 1 new comment

• Split import-untyped into import-untyped and import-untyped-stubs-available

  #19101 commented on Jul 29, 2025 • 0 new comments

• Fix/attrs init overload

  #19104 commented on Jul 31, 2025 • 0 new comments

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

  #19168 commented on Aug 1, 2025 • 0 new comments

• feat: new mypyc primitives for weakref.proxy

  #19217 commented on Aug 4, 2025 • 0 new comments

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

  #19347 commented on Aug 1, 2025 • 0 new comments

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

  #19374 commented on Aug 1, 2025 • 0 new comments

• [PEP 696] Fix swapping TypeVars with defaults.

  #19449 commented on Jul 28, 2025 • 0 new comments

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

  #19466 commented on Jul 28, 2025 • 0 new comments

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

  #19471 commented on Jul 28, 2025 • 0 new comments

• feat: `__repr__` method for RefExpr and NameExpr

  #19486 commented on Aug 4, 2025 • 0 new comments

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

  #19511 commented on Aug 4, 2025 • 0 new comments

• feat: index-range err code

  #19513 commented on Aug 4, 2025 • 0 new comments

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

  #19517 commented on Aug 1, 2025 • 0 new comments

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

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

• Allow mypy to flag `str` matching against `Sequence[str]` as an error

  #11001 commented on Jul 29, 2025 • 0 new comments

• Allow ignore to be on any line of multi-line statement

  #12341 commented on Jul 30, 2025 • 0 new comments

• Include binary wheels for ARM Windows

  #18593 commented on Jul 30, 2025 • 0 new comments

• EncodingWarning when running under PyPy

  #17057 commented on Jul 31, 2025 • 0 new comments

• 1.17 Release Planning

  #19306 commented on Jul 31, 2025 • 0 new comments

• False positive typing.Self has incompatible type when method uses class' generic type

  #16871 commented on Jul 31, 2025 • 0 new comments

• `func-returns-value` false positive for union type?

  #19433 commented on Aug 1, 2025 • 0 new comments

• Type hint `__lt__` as `(self, other: Self) -> bool` makes mypy think that `__le__` is not supported.

  #16711 commented on Aug 1, 2025 • 0 new comments

• No `TypeVar` variable inference in ternary operators

  #18817 commented on Aug 1, 2025 • 0 new comments

• plugin point for `ClassDef`

  #18729 commented on Aug 1, 2025 • 0 new comments

• Mypy/dmypy takes over 16GB of memory

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

• Improve precision of mypy performance tracking

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

• Meta issue tracker, pt 2

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

• Disallow literal `0` step in slice expressions

  #18065 commented on Jul 29, 2025 • 0 new comments

• PEP 702 (@deprecated): improve the handling of overloaded functions and methods

  #18682 commented on Aug 4, 2025 • 0 new comments

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

  #18969 commented on Jul 29, 2025 • 0 new comments

• Add a flag `--enable-all-error-codes`, which enables all error codes

  #19048 commented on Jul 31, 2025 • 0 new comments

• feat(mypyc): proper weakref support

  #19056 commented on Aug 4, 2025 • 0 new comments

• Improve cli help somewhat

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