TYP: __getitem__ method of EA #37898
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simonjayhawkins commented Nov 16, 2020
| def __getitem__(self, key): | ||
| def __getitem__( | ||
| self: NDArrayBackedExtensionArrayT, key: Union[int, slice, np.ndarray] | ||
| ) -> Union[NDArrayBackedExtensionArrayT, Any]: |
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cc @jorisvandenbossche if typevar is not used, mypy gives
pandas\core\arrays\datetimelike.py:280: error: Item "NDArrayBackedExtensionArray" of "Union[NDArrayBackedExtensionArray, Any]" has no attribute "_freq" [union-attr] 
simonjayhawkins added ExtensionArray This was referenced Nov 16, 2020
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| lgtm any comments @jbrockmendel @jorisvandenbossche |
| # type (Any) -> Any | ||
| def __getitem__( | ||
| self, item: Union[int, slice, np.ndarray] | ||
| ) -> Union[ExtensionArray, Any]: |
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should ExtensionArray be a typevar here?
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yes it should. Until there is consensus on usage have only added where needed to keep mypy green. see #37898 (comment), #37817 (comment), #31728 (comment), #31384 (comment) and others
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| thanks @simonjayhawkins |
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as a precursor to #35259 (comment)
there are more changes/additions needed but this PR might get too big to review and push through in a timely manor.
overload is required to avoid casts
Any is used for any type, whereas should use object.
only the abstract classes have been typed.
could create a scalar type alias in each of the EA classes similar to DTScalarOrNaT in DatetimeLikeArrayMixin
import and expose pandas._libs.missing.NAType in pandas._typing
any of these could be done here or as follow-on