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GH 25298: Add test for interval index in multiindex #62794

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GH 25298: Add test for interval index in multiindex #62794

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GH 25298: Add test for interval index in multiindex
harinik Oct 22, 2025
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harinik Oct 22, 2025
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lint
harinik Oct 22, 2025
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lint once more
harinik Oct 22, 2025
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move test
harinik Oct 24, 2025
a7e9a4e
fix test
harinik Oct 30, 2025
73cea1f
fix test
harinik Nov 4, 2025
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fix series name
harinik Nov 13, 2025
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12 changes: 12 additions & 0 deletions pandas/tests/indexing/interval/test_interval.py
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Original file line number Diff line number Diff line change
Expand Up @@ -222,3 +222,15 @@ def test_reindex_behavior_with_interval_index(self, base):
expected_result = Series([np.nan, 0], index=[np.nan, 1.0], dtype=float)
result = ser.reindex(index=[np.nan, 1.0])
tm.assert_series_equal(result, expected_result)

def test_multiindex_with_interval_index(self):
# for GH#25298
intIndex = IntervalIndex.from_arrays([1, 5, 8, 13, 16], [4, 9, 12, 17, 20])
multiIndex = pd.MultiIndex.from_arrays([["a", "a", "b", "b", "c"], intIndex])
data = [(1, 2), (3, 4), (5, 6), (7, 8), (9, 10)]
df = DataFrame(data, index=multiIndex)
result1 = df.loc[("b", 16)]
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@natmokval natmokval Nov 13, 2025

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@harinik, one small comment: could you please rename result1 to result?

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@harinik harinik Nov 13, 2025

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done

expected = Series([7, 8])
tm.assert_series_equal(result1, expected, check_names=False)
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@mroeschke mroeschke Nov 10, 2025

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Can we add a name= to the Series so we do not need to call check_names=False?

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@natmokval natmokval Nov 13, 2025

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@harinik, in case you need help with this comment:
When you define

expected = Series([7, 8], name=('b', Interval(13, 17, closed='right')))

your test should work without passing check_names=False.
(import Interval as well)

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@harinik harinik Nov 13, 2025

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I did that but it did not work for some reason. When I tried changing it to:

expected = Series([7, 8], name="('b', Interval(13, 17, closed='right'))")

and removed check_names=False it fails with:

E       Attribute "name" are different
E       [left]:  ('b', Interval(13, 17, closed='right'))
E       [right]: ('b', Interval(13, 17, closed='right'))

I am not quite sure what I am doing wrong.

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@natmokval natmokval Nov 13, 2025

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the name has type tuple, not a string (just remove the quotes)

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@harinik harinik Nov 13, 2025

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Ah I hadn't realized that, thank you for catching. Fixed now.

result2 = df.loc["b"].loc[16]
tm.assert_series_equal(result2, expected, check_names=False)
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