Sync typeshed#21232
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hauntsaninja merged 12 commits intomasterfrom May 7, 2026
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Source commit: python/typeshed@e4d32e0
This is allegedly causing large performance problems, see 13821 typeshed/8231 had zero hits on mypy_primer, so it's not the worst thing to undo. Patching this in typeshed also feels weird, since there's a more general soundness issue. If a typevar has a bound or constraint, we might not want to solve it to a Literal. If we can confirm the performance regression or fix the unsoundness within mypy, I might pursue upstreaming this in typeshed. (Reminder: add this to the sync_typeshed script once merged)
The plugin provides superior type checking: #13987 (comment) A manual cherry-pick of e437cdf.
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False positives come from python/typeshed#15598 and python/typeshed#15601 |
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Okay, reverted those two PRs |
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Diff from mypy_primer, showing the effect of this PR on open source code: core (https://github.com/home-assistant/core)
+ homeassistant/components/google_generative_ai_conversation/entity.py:175: error: Unused "type: ignore" comment [unused-ignore]
materialize (https://github.com/MaterializeInc/materialize)
- misc/python/materialize/mzcompose/composition.py:101: note: def parse_known_args(self, args: Sequence[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
+ misc/python/materialize/mzcompose/composition.py:101: note: def parse_known_args(self, args: Iterable[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
- misc/python/materialize/mzcompose/composition.py:101: note: def [_N] parse_known_args(self, args: Sequence[str] | None, namespace: _N) -> tuple[_N, list[str]]
+ misc/python/materialize/mzcompose/composition.py:101: note: def [_N] parse_known_args(self, args: Iterable[str] | None, namespace: _N) -> tuple[_N, list[str]]
- misc/python/materialize/cli/mzcompose.py:1044: note: def parse_known_args(self, args: Sequence[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1044: note: def parse_known_args(self, args: Iterable[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
- misc/python/materialize/cli/mzcompose.py:1044: note: def [_N] parse_known_args(self, args: Sequence[str] | None, namespace: _N) -> tuple[_N, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1044: note: def [_N] parse_known_args(self, args: Iterable[str] | None, namespace: _N) -> tuple[_N, list[str]]
- misc/python/materialize/cli/mzcompose.py:1056: note: def parse_known_args(self, args: Sequence[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1056: note: def parse_known_args(self, args: Iterable[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
- misc/python/materialize/cli/mzcompose.py:1056: note: def [_N] parse_known_args(self, args: Sequence[str] | None, namespace: _N) -> tuple[_N, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1056: note: def [_N] parse_known_args(self, args: Iterable[str] | None, namespace: _N) -> tuple[_N, list[str]]
- misc/python/materialize/cli/scratch/__main__.py:101: error: Argument "aliases" to "add_parser" of "_SubParsersAction" has incompatible type "str | Callable[[Any], Any] | Callable[[], None] | Callable[[ArgumentParser], None] | Callable[[Namespace], None] | list[str]"; expected "Sequence[str]" [arg-type]
+ misc/python/materialize/cli/scratch/__main__.py:101: error: Argument "aliases" to "add_parser" of "_SubParsersAction" has incompatible type "str | Callable[[Any], Any] | Callable[[], None] | Callable[[ArgumentParser], None] | Callable[[Namespace], None] | list[str]"; expected "Iterable[str]" [arg-type]
mitmproxy (https://github.com/mitmproxy/mitmproxy)
+ mitmproxy/utils/strutils.py:125: error: Unused "type: ignore" comment [unused-ignore]
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Sync typeshed
Source commit:
python/typeshed@e4d32e0
Note that you will need to close and re-open the PR in order to trigger CI.