TYP: mean and ndarray.mean shape-typing and improved dtypes#31151
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Diff from mypy_primer, showing the effect of this PR on type check results on a corpus of open source code: colour (https://github.com/colour-science/colour)
- colour/utilities/metrics.py:88: error: Incompatible return value type (got "floating[_16Bit] | floating[_32Bit] | float64", expected "ndarray[tuple[Any, ...], dtype[floating[_16Bit] | floating[_32Bit] | float64]]") [return-value]
+ colour/recovery/otsu2018.py:905: error: Redundant cast to "ndarray[tuple[Any, ...], dtype[floating[_16Bit] | floating[_32Bit] | float64]]" [redundant-cast]
scipy (https://github.com/scipy/scipy)
- scipy/signal/_spectral_py.py:275: error: Item "Buffer" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | str | _NestedSequence[complex | bytes | str]" has no attribute "reshape" [union-attr]
- scipy/signal/_spectral_py.py:275: error: Item "_SupportsArray[dtype[Any]]" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | str | _NestedSequence[complex | bytes | str]" has no attribute "reshape" [union-attr]
- scipy/signal/_spectral_py.py:275: error: Item "_NestedSequence[_SupportsArray[dtype[Any]]]" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | str | _NestedSequence[complex | bytes | str]" has no attribute "reshape" [union-attr]
- scipy/signal/_spectral_py.py:275: error: Item "complex" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | str | _NestedSequence[complex | bytes | str]" has no attribute "reshape" [union-attr]
- scipy/signal/_spectral_py.py:275: error: Item "str" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | str | _NestedSequence[complex | bytes | str]" has no attribute "reshape" [union-attr]
- scipy/signal/_spectral_py.py:275: error: Item "_NestedSequence[complex | bytes | str]" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | str | _NestedSequence[complex | bytes | str]" has no attribute "reshape" [union-attr]
- scipy/signal/_spectral_py.py:320: error: Item "Buffer" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str]" has no attribute "dtype" [union-attr]
- scipy/signal/_spectral_py.py:320: error: Item "_SupportsArray[dtype[Any]]" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str]" has no attribute "dtype" [union-attr]
- scipy/signal/_spectral_py.py:320: error: Item "_NestedSequence[_SupportsArray[dtype[Any]]]" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str]" has no attribute "dtype" [union-attr]
- scipy/signal/_spectral_py.py:320: error: Item "complex" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str]" has no attribute "dtype" [union-attr]
- scipy/signal/_spectral_py.py:320: error: Item "bytes" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str]" has no attribute "dtype" [union-attr]
- scipy/signal/_spectral_py.py:320: error: Item "str" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str]" has no attribute "dtype" [union-attr]
- scipy/signal/_spectral_py.py:320: error: Item "_NestedSequence[complex | bytes | str]" of "Buffer | _SupportsArray[dtype[Any]] | _NestedSequence[_SupportsArray[dtype[Any]]] | complex | bytes | str | _NestedSequence[complex | bytes | str]" has no attribute "dtype" [union-attr]
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Thanks Joren. |
This was referenced Apr 4, 2026
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This significantly improves
np.meanandnp.ndarray.mean. These now have support for shape-typing, and have improved input-dependent return dtypes.This also fixes the incompatible overlapping overloads in
np.mean, towards #27032Once this is reviewed and merged, I'll do the same for
stdandvar.AI Disclosure
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