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- import pytest
- from pandas import (
- DataFrame,
- Index,
- MultiIndex,
- )
- import pandas._testing as tm
- class TestDropLevel:
- def test_droplevel(self, frame_or_series):
- # GH#20342
- cols = MultiIndex.from_tuples(
- [("c", "e"), ("d", "f")], names=["level_1", "level_2"]
- )
- mi = MultiIndex.from_tuples([(1, 2), (5, 6), (9, 10)], names=["a", "b"])
- df = DataFrame([[3, 4], [7, 8], [11, 12]], index=mi, columns=cols)
- if frame_or_series is not DataFrame:
- df = df.iloc[:, 0]
- # test that dropping of a level in index works
- expected = df.reset_index("a", drop=True)
- result = df.droplevel("a", axis="index")
- tm.assert_equal(result, expected)
- if frame_or_series is DataFrame:
- # test that dropping of a level in columns works
- expected = df.copy()
- expected.columns = Index(["c", "d"], name="level_1")
- result = df.droplevel("level_2", axis="columns")
- tm.assert_equal(result, expected)
- else:
- # test that droplevel raises ValueError on axis != 0
- with pytest.raises(ValueError, match="No axis named columns"):
- df.droplevel(1, axis="columns")
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