13 Pull requests merged by 4 people

• 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

• Cache type_object_type()

  #19514 merged Jul 27, 2025

• Fix #19507 Prevent final reassignment in match case

  #19496 merged Jul 27, 2025

• Avoid duplicate visit in check_boolean_op()

  #19515 merged Jul 26, 2025

• docs: update cython and setuptools RTD URLs

  #19512 merged Jul 26, 2025

• Optimize generic inference passes

  #19501 merged Jul 25, 2025

• Use normalized tuples for fallback calculation

  #19111 merged Jul 22, 2025

11 Pull requests opened by 6 people

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

  #19494 opened Jul 24, 2025

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

  #19497 opened Jul 24, 2025

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

  #19499 opened Jul 24, 2025

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

  #19503 opened Jul 25, 2025

• Enable pretty by default

  #19510 opened Jul 25, 2025

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

  #19511 opened Jul 25, 2025

• feat: index-range err code

  #19513 opened Jul 26, 2025

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

  #19517 opened Jul 27, 2025

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

  #19518 opened Jul 28, 2025

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

  #19527 opened Jul 28, 2025

• [mypyc] Add prefix to attributes of generator classes

  #19535 opened Jul 29, 2025

13 Issues closed by 4 people

• Mypy stuck with polynomial using NumPy

  #14978 closed Jul 29, 2025

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

  #13434 closed Jul 28, 2025

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

  #18720 closed Jul 28, 2025

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

  #19392 closed Jul 28, 2025

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

  #18989 closed Jul 28, 2025

• Assignment to final variables is allowed in a match statement

  #19507 closed Jul 27, 2025

• Bogus warning with `ItemsView`

  #19495 closed Jul 27, 2025

• MyPy 1.11.0 loop variable persistance

  #17541 closed Jul 26, 2025

• Tight type scoping for loop local variables

  #19504 closed Jul 26, 2025

• Check format strings in logger calls

  #19508 closed Jul 26, 2025

• Kwargs after ParamSpec.args should be tolerated

  #19506 closed Jul 25, 2025

• Add `--warn-unreachable` to strict mode

  #11223 closed Jul 24, 2025

• `class S(tuple[*tuple[()]])` crashes mypy

  #19105 closed Jul 22, 2025

18 Issues opened by 18 people

• 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

• 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

• Condition can't be inferred, unable to merge overloads

  #19516 opened Jul 27, 2025

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

  #19509 opened Jul 25, 2025

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

  #19500 opened Jul 24, 2025

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

  #19498 opened Jul 24, 2025

• Inconsistent assignability of callable with optional keywords to positional-only callback

  #19493 opened Jul 23, 2025

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

  #19492 opened Jul 23, 2025

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

  #19491 opened Jul 23, 2025

27 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.

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

  #19473 commented on Jul 27, 2025 • 5 new comments

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

  #19471 commented on Jul 28, 2025 • 4 new comments

• feat: new mypyc primitive for weakref.ref

  #19099 commented on Jul 29, 2025 • 1 new comment

• Add `collections._tuplegetter` support

  #19479 commented on Jul 23, 2025 • 0 new comments

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

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

• [PEP 696] Fix swapping TypeVars with defaults.

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

• feat(overloads): Expand finite sum types into a union of possible types

  #19431 commented on Jul 25, 2025 • 0 new comments

• Draft: Solve intermediate variable bug

  #19399 commented on Jul 24, 2025 • 0 new comments

• Fix/attrs init overload

  #19104 commented on Jul 25, 2025 • 0 new comments

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

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

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

  #19048 commented on Jul 23, 2025 • 0 new comments

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

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

• Narrow literals in the negative case even with custom equality

  #18574 commented on Jul 26, 2025 • 0 new comments

• Disallow literal `0` step in slice expressions

  #18065 commented on Jul 29, 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

• [plugins/help] Triggering node visits?

  #19481 commented on Jul 28, 2025 • 0 new comments

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

  #19377 commented on Jul 28, 2025 • 0 new comments

• 1.17 Release Planning

  #19306 commented on Jul 27, 2025 • 0 new comments

• Type narrowing broken with dict items

  #18440 commented on Jul 26, 2025 • 0 new comments

• ParamSpec seems to get lost with partial()

  #18589 commented on Jul 26, 2025 • 0 new comments

• Type narrowing on all() call

  #13069 commented on Jul 25, 2025 • 0 new comments

• (🎁) Flag to make default return type `None` instead of `Any`

  #9413 commented on Jul 24, 2025 • 0 new comments

• `--no-incremental` still writes `.mypy_cache`

  #19489 commented on Jul 24, 2025 • 0 new comments

• Generic subclass of a generic class, using a constrained TypeVar is mishandled

  #17757 commented on Jul 24, 2025 • 0 new comments

• Add a way to ignore `type: ignore`, disabled error codes

  #13201 commented on Jul 23, 2025 • 0 new comments

• Can JSON format output and command line parameter options for -- disable-error-code all be supported?

  #17446 commented on Jul 23, 2025 • 0 new comments

• Enable --warn-unreachable in --strict in Mypy 2.0

  #18078 commented on Jul 23, 2025 • 0 new comments