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TYP: Work around a mypy issue with bool arrays #29248

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Jun 26, 2025
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TYP: Work around a mypy issue with bool arrays #29248

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TYP: Work around a mypy issue with bool arrays
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@jorenham
jorenham committed Jun 25, 2025
commit ee46ea14ee25a5a5daf84f4a01957f7c59840583
6 changes: 3 additions & 3 deletions numpy/__init__.pyi
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Expand Up @@ -3848,14 +3848,14 @@ class bool(generic[_BoolItemT_co], Generic[_BoolItemT_co]):
@property
def imag(self) -> np.bool[L[False]]: ...

@overload
def __init__(self: np.bool[L[False]], /) -> None: ...
@overload # mypy bug workaround: https://github.com/numpy/numpy/issues/29245
def __init__(self: np.bool[builtins.bool], value: Never, /) -> None: ...
@overload
def __init__(self: np.bool[L[False]], value: _Falsy = ..., /) -> None: ...
@overload
def __init__(self: np.bool[L[True]], value: _Truthy, /) -> None: ...
@overload
def __init__(self, value: object, /) -> None: ...
def __init__(self: np.bool[builtins.bool], value: object, /) -> None: ...

def __bool__(self, /) -> _BoolItemT_co: ...
@overload
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2 changes: 2 additions & 0 deletions numpy/typing/tests/data/reveal/array_constructors.pyi
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Expand Up @@ -39,6 +39,8 @@ assert_type(np.array(B, subok=True), SubClass[np.float64])
assert_type(np.array(B, subok=True, ndmin=0), SubClass[np.float64])
assert_type(np.array(B, subok=True, ndmin=1), SubClass[np.float64])
assert_type(np.array(D), npt.NDArray[np.float64 | np.int64])
# https://github.com/numpy/numpy/issues/29245
assert_type(np.array([], dtype=np.bool), npt.NDArray[np.bool])

assert_type(np.zeros([1, 5, 6]), npt.NDArray[np.float64])
assert_type(np.zeros([1, 5, 6], dtype=np.int64), npt.NDArray[np.int64])
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3 changes: 1 addition & 2 deletions numpy/typing/tests/data/reveal/ma.pyi
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Expand Up @@ -357,8 +357,7 @@ assert_type(MAR_b.swapaxes(0, 1), MaskedArray[np.bool])
assert_type(MAR_2d_f4.swapaxes(1, 0), MaskedArray[np.float32])

assert_type(np.ma.nomask, np.bool[Literal[False]])
# https://github.com/python/mypy/issues/18974
assert_type(np.ma.MaskType, type[np.bool]) # type: ignore[assert-type]
assert_type(np.ma.MaskType, type[np.bool])

assert_type(MAR_1d.__setmask__([True, False]), None)
assert_type(MAR_1d.__setmask__(np.False_), None)
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