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REGR: DataFrame.reset_index with empty RangeIndex #45377

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Merged
merged 1 commit into from
Jan 16, 2022
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REGR: DataFrame.reset_index with empty RangeIndex #45377

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10 changes: 8 additions & 2 deletions pandas/core/indexes/base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2081,8 +2081,14 @@ def _drop_level_numbers(self, levnums: list[int]):

if len(lev) == 0:
# If lev is empty, lev.take will fail GH#42055
res_values = algos.take(lev._values, new_codes[0], allow_fill=True)
result = type(lev)._simple_new(res_values, name=new_names[0])
if len(new_codes[0]) == 0:
# GH#45230 preserve RangeIndex here
# see test_reset_index_empty_rangeindex
result = lev[:0]
else:
res_values = algos.take(lev._values, new_codes[0], allow_fill=True)
# _constructor instead of type(lev) for RangeIndex compat GH#35230
result = lev._constructor._simple_new(res_values, name=new_names[0])
else:
# set nan if needed
mask = new_codes[0] == -1
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11 changes: 11 additions & 0 deletions pandas/tests/frame/methods/test_reset_index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,17 @@


class TestResetIndex:
def test_reset_index_empty_rangeindex(self):
# GH#45230
df = DataFrame(
columns=["brand"], dtype=np.int64, index=RangeIndex(0, 0, 1, name="foo")
)

df2 = df.set_index([df.index, "brand"])

result = df2.reset_index([1], drop=True)
tm.assert_frame_equal(result, df[[]], check_index_type=True)

def test_set_reset(self):

idx = Index([2 ** 63, 2 ** 63 + 5, 2 ** 63 + 10], name="foo")
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