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BUG: Raise TypeError for mismatched signed/unsigned dtypes in IntervalIndex.from_arrays #62376

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BUG: Raise TypeError for mismatched signed/unsigned dtypes in IntervalIndex.from_arrays #62376

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736ae02
BUG: Raise TypeError for mismatched signed/unsigned dtypes in Interva…
Aniketsy Sep 18, 2025
439efbe
BUG: Raise TypeError for mismatched signed/unsigned dtypes
Aniketsy Oct 3, 2025
ed887d9
BUG: Raise TypeError for mismatched signed/unsigned dtypes
Aniketsy Oct 9, 2025
f7433c8
BUG: Raise TypeError for mismatched signed/unsigned dtypes
Aniketsy Oct 10, 2025
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v3.0.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -958,7 +958,7 @@ Interval
^^^^^^^^
- :meth:`Index.is_monotonic_decreasing`, :meth:`Index.is_monotonic_increasing`, and :meth:`Index.is_unique` could incorrectly be ``False`` for an ``Index`` created from a slice of another ``Index``. (:issue:`57911`)
- Bug in :func:`interval_range` where start and end numeric types were always cast to 64 bit (:issue:`57268`)
-
- Construction of :class:`IntervalArray` and :class:`IntervalIndex` from arrays with mismatched signed/unsigned integer dtypes (e.g., ``int64`` and ``uint64``) now raises a :exc:`TypeError` instead of proceeding silently. (:issue:`55715`)

Indexing
^^^^^^^^
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15 changes: 15 additions & 0 deletions pandas/core/arrays/interval.py
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Expand Up @@ -536,6 +536,21 @@ def from_arrays(
left = _maybe_convert_platform_interval(left)
right = _maybe_convert_platform_interval(right)

# Check for mismatched signed/unsigned integer dtypes
left_dtype = getattr(left, "dtype", None)
right_dtype = getattr(right, "dtype", None)
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i think putting this after the _maybe_convert_platform_interval calls would be more robust. e.g. if one is a list and the other is uint64?

Also is it just int vs uint we care about, or also e.g. int32 vs int64?

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We are checking int vs unit .

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is there a reason not to move this to after the _maybe_convert_platform_interval calls?

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no, i have updated, also added whatsnew note, please let me know if this needs improvement.

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the getattr should be unnecessary. the attribute should always be there now that this is moved to after

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thanks, got it. i have updated the code and removed none check for dtype.

if (
left_dtype is not None
and right_dtype is not None
and left_dtype.kind in "iu"
and right_dtype.kind in "iu"
and left_dtype.kind != right_dtype.kind
):
raise TypeError(
f"Left and right arrays must have matching signedness. "
f"Got {left_dtype} and {right_dtype}."
)

left, right, dtype = cls._ensure_simple_new_inputs(
left,
right,
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8 changes: 8 additions & 0 deletions pandas/tests/indexes/interval/test_interval.py
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Expand Up @@ -882,6 +882,14 @@ def test_is_all_dates(self):
assert not year_2017_index._is_all_dates


def test_from_arrays_mismatched_signedness_raises():
# GH 55715
left = np.array([0, 1, 2], dtype="int64")
right = np.array([1, 2, 3], dtype="uint64")
with pytest.raises(TypeError, match="matching signedness"):
IntervalIndex.from_arrays(left, right)


def test_dir():
# GH#27571 dir(interval_index) should not raise
index = IntervalIndex.from_arrays([0, 1], [1, 2])
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