Merge pull request #31426 from jorenham/backport-31425

charris · web-flow · commit be6123aecff7 · 2026-05-13T10:50:21.000-06:00
TYP: Fix `DTypeLike` runtime type-checker support (#31425)
diff --git a/numpy/_typing/_dtype_like.py b/numpy/_typing/_dtype_like.py
@@ -1,5 +1,5 @@
-from collections.abc import Sequence  # noqa: F811
-from typing import Any, Protocol, TypeAlias, TypedDict, TypeVar
+from collections.abc import Sequence
+from typing import Any, Protocol, TypeAlias, TypedDict, TypeVar, runtime_checkable
 
 import numpy as np
 
@@ -41,11 +41,13 @@ class _DTypeDict(_DTypeDictBase, total=False):
     aligned: bool
 
 
+@runtime_checkable
 class _HasDType(Protocol[_DTypeT_co]):
     @property
     def dtype(self) -> _DTypeT_co: ...
 
 
+@runtime_checkable
 class _HasNumPyDType(Protocol[_DTypeT_co]):
     @property
     def __numpy_dtype__(self, /) -> _DTypeT_co: ...
