[ty] Use _cls as argument name for collections.namedtuple#24333
Merged
charliermarsh merged 1 commit intomainfrom Mar 31, 2026
Merged
[ty] Use _cls as argument name for collections.namedtuple#24333charliermarsh merged 1 commit intomainfrom
_cls as argument name for collections.namedtuple#24333charliermarsh merged 1 commit intomainfrom
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Typing conformance resultsNo changes detected ✅Current numbersThe percentage of diagnostics emitted that were expected errors held steady at 86.61%. The percentage of expected errors that received a diagnostic held steady at 81.56%. The number of fully passing files held steady at 70/132. |
Memory usage reportMemory usage unchanged ✅ |
|
| Lint rule | Added | Removed | Changed |
|---|---|---|---|
invalid-await |
0 | 40 | 0 |
invalid-argument-type |
0 | 4 | 0 |
missing-argument |
0 | 3 | 0 |
parameter-already-assigned |
0 | 3 | 0 |
invalid-return-type |
0 | 1 | 0 |
| Total | 0 | 51 | 0 |
Changes in flaky projects detected. Raw diff output excludes flaky projects; see the HTML report for details.
Raw diff:
core (https://github.com/home-assistant/core)
- homeassistant/components/xbox/browse_media.py:33:12 error[missing-argument] No argument provided for required parameter `cls`
- homeassistant/components/xbox/browse_media.py:35:9 error[invalid-argument-type] Argument is incorrect: Expected `type[MediaTypeDetails]`, found `Literal[MediaClass.APP]`
- homeassistant/components/xbox/browse_media.py:35:9 error[parameter-already-assigned] Multiple values provided for parameter `cls`
- homeassistant/components/xbox/browse_media.py:37:13 error[missing-argument] No argument provided for required parameter `cls`
- homeassistant/components/xbox/browse_media.py:39:9 error[invalid-argument-type] Argument is incorrect: Expected `type[MediaTypeDetails]`, found `Literal[MediaClass.GAME]`
- homeassistant/components/xbox/browse_media.py:39:9 error[parameter-already-assigned] Multiple values provided for parameter `cls`
django-stubs (https://github.com/typeddjango/django-stubs)
- mypy_django_plugin/lib/helpers.py:226:16 error[missing-argument] No argument provided for required parameter `cls`
- mypy_django_plugin/lib/helpers.py:226:20 error[invalid-argument-type] Argument is incorrect: Argument type `Model` does not satisfy upper bound `DjangoModel` of type variable `Self`
- mypy_django_plugin/lib/helpers.py:226:20 error[invalid-argument-type] Argument is incorrect: Expected `type[DjangoModel]`, found `type[Model]`
- mypy_django_plugin/lib/helpers.py:226:20 error[parameter-already-assigned] Multiple values provided for parameter `cls`
charliermarsh
requested review from
AlexWaygood,
carljm,
dcreager,
ibraheemdev and
sharkdp
as code owners
AlexWaygood
approved these changes
Mar 31, 2026
Comment on lines
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| Field names that would otherwise collide with the synthetic constructor receiver still work as | ||
| keyword arguments, matching CPython's generated `__new__(_cls, ...)` signature: |
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I would just describe this with
Suggested change
| Field names that would otherwise collide with the synthetic constructor receiver still work as | |
| keyword arguments, matching CPython's generated `__new__(_cls, ...)` signature: | |
| Regression test for https://github.com/astral-sh/ty/issues/3184: the first parameter of `__new__` | |
| at runtime for a namedtuple class is `_cls`, meaning that `cls` can be used as a field name: |
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| PInfo(inst=None, cls=str) | ||
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| class StaticInfo(NamedTuple): | ||
| inst: object | None | ||
| cls: type[str] | ||
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| StaticInfo(inst=None, cls=str) |
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Suggested change
| PInfo(inst=None, cls=str) | |
| class StaticInfo(NamedTuple): | |
| inst: object | None | |
| cls: type[str] | |
| StaticInfo(inst=None, cls=str) | |
| reveal_type(PInfo(inst=None, cls=str)) # revealed: PInfo | |
| class StaticInfo(NamedTuple): | |
| inst: object | None | |
| cls: type[str] | |
| reveal_type(StaticInfo(inst=None, cls=str)) # revealed: StaticInfo |
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* main: [ty] Add missing test case for inline functional TypedDict with an invalid type passed to the `name` parameter (#24334) [ty] Use `_cls` as argument name for `collections.namedtuple` (#24333) [ty] Emit diagnostic for functional TypedDict with non-literal name (#24331) Add `nested-string-quote-style` formatting option (#24312) `RUF010`: Mark fix as unsafe when it deletes a comment [ty] Fix semantic token classification for properties accessed on instances (#24065) publish installers to `/installers/ruff/latest` on the mirror (#24247)
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Summary
I believe this is defined here: https://github.com/python/cpython/blob/362145c20ebb08d2f850a49d356ecee858a281ae/Lib/collections/__init__.py#L446.
Closes astral-sh/ty#3184.