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Index: ensure Index(DatetimeIndex) returns DatetimeIndex (fixes #1440) #1456

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Merged
merged 4 commits into from
Oct 30, 2025
Merged

Index: ensure Index(DatetimeIndex) returns DatetimeIndex (fixes #1440) #1456

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fac9e80
Index: ensure Index(DatetimeIndex) returns DatetimeIndex (fixes #1440)
yusufcank34 Oct 29, 2025
dbfe078
Add isolated test for Index(DatetimeIndex) typing (GH#1440)
yusufcank34 Oct 29, 2025
773fdfc
Fix: Index(DatetimeIndex) now returns DatetimeIndex; consolidated tes…
yusufcank34 Oct 29, 2025
c5b0d15
Remove redundant test_datetime_index_1440.py and run pre-commit
yusufcank34 Oct 30, 2025
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14 changes: 13 additions & 1 deletion pandas-stubs/core/indexes/base.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -187,7 +187,9 @@ class Index(IndexOpsMixin[S1], ElementOpsMixin[S1]):
@overload
def __new__(
cls,
data: Sequence[np.datetime64 | datetime] | IndexOpsMixin[datetime],
data: (
Sequence[np.datetime64 | datetime] | IndexOpsMixin[datetime] | DatetimeIndex
),
*,
dtype: TimestampDtypeArg = ...,
copy: bool = ...,
Expand Down Expand Up @@ -274,6 +276,16 @@ class Index(IndexOpsMixin[S1], ElementOpsMixin[S1]):
name: Hashable = ...,
tupleize_cols: bool = ...,
) -> IntervalIndex[Interval[Any]]: ...
@overload
def __new__(
cls,
data: DatetimeIndex,
*,
dtype: TimestampDtypeArg | None = ...,
copy: bool = ...,
name: Hashable = ...,
tupleize_cols: bool = ...,
) -> DatetimeIndex: ...
# generic overloads
@overload
def __new__(
Expand Down
2 changes: 1 addition & 1 deletion tests/indexes/test_datetime_index.py
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Expand Up @@ -24,7 +24,7 @@ def test_index_relops() -> None:
)
x = pd.Timestamp("2022-01-17")
idx = check(
assert_type(pd.Index(data, name="date"), "pd.Index[pd.Timestamp]"), pd.Index
assert_type(pd.Index(data, name="date"), pd.DatetimeIndex), pd.DatetimeIndex
)
check(assert_type(data[x <= idx], pd.DatetimeIndex), pd.DatetimeIndex)
check(assert_type(data[x < idx], pd.DatetimeIndex), pd.DatetimeIndex)
Expand Down