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GH1419 Allow Series and Index for other in Index.where(..., other) #1420

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GH1419 Allow Series and Index for other in Index.where(..., other) #1420

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86c94eb
GH1419 Allow Series and Index for other in Index.where(..., other)
loicdiridollou Oct 9, 2025
a6653dc
GH1419 PR Feedback
loicdiridollou Oct 10, 2025
0659166
GH1419 PR Feedback
loicdiridollou Oct 10, 2025
96c8a14
GH1419 PR Feedback
loicdiridollou Oct 10, 2025
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4 changes: 2 additions & 2 deletions pandas-stubs/core/indexes/base.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@ from pandas._typing import (
T_COMPLEX,
T_INT,
AnyAll,
ArrayLike,
AnyArrayLike,
AxesData,
CategoryDtypeArg,
DropKeep,
Expand Down Expand Up @@ -434,7 +434,7 @@ class Index(IndexOpsMixin[S1]):
@property
def values(self) -> np_1darray: ...
def memory_usage(self, deep: bool = False): ...
def where(self, cond, other: Scalar | ArrayLike | None = None): ...
def where(self, cond, other: Scalar | AnyArrayLike | None = None) -> Self: ...
def __contains__(self, key) -> bool: ...
@final
def __setitem__(self, key, value) -> None: ...
Expand Down
16 changes: 16 additions & 0 deletions tests/indexes/test_indexes.py
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Expand Up @@ -19,6 +19,7 @@
from pandas.core.arrays.timedeltas import TimedeltaArray
from pandas.core.indexes.base import Index
from pandas.core.indexes.category import CategoricalIndex
from pandas.core.indexes.datetimes import DatetimeIndex
from typing_extensions import (
Never,
assert_type,
Expand Down Expand Up @@ -1608,3 +1609,18 @@ def test_to_series() -> None:
np.complexfloating,
)
check(assert_type(Index(["1"]).to_series(), "pd.Series[str]"), pd.Series, str)


def test_index_where() -> None:
"""Test Index.where with multiple types of other GH1419."""
datetime_index = pd.DatetimeIndex(
pd.date_range(start="2025-01-01", freq="h", periods=48)
)
mask = np.ones(48, dtype=bool)
val_idx = datetime_index.where(mask, datetime_index - pd.Timedelta(days=1))
check(assert_type(val_idx, DatetimeIndex), DatetimeIndex)

val_sr = datetime_index.where(
mask, (datetime_index - pd.Timedelta(days=1)).to_series()
)
check(assert_type(val_sr, DatetimeIndex), DatetimeIndex)