import re
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import numpy as np
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import pytest
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from pandas import (
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DataFrame,
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MultiIndex,
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)
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class TestDataFrameDelItem:
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def test_delitem(self, float_frame):
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del float_frame["A"]
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assert "A" not in float_frame
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def test_delitem_multiindex(self):
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midx = MultiIndex.from_product([["A", "B"], [1, 2]])
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df = DataFrame(np.random.randn(4, 4), columns=midx)
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assert len(df.columns) == 4
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assert ("A",) in df.columns
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assert "A" in df.columns
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result = df["A"]
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assert isinstance(result, DataFrame)
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del df["A"]
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assert len(df.columns) == 2
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# A still in the levels, BUT get a KeyError if trying
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# to delete
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assert ("A",) not in df.columns
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with pytest.raises(KeyError, match=re.escape("('A',)")):
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del df[("A",)]
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# behavior of dropped/deleted MultiIndex levels changed from
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# GH 2770 to GH 19027: MultiIndex no longer '.__contains__'
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# levels which are dropped/deleted
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assert "A" not in df.columns
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with pytest.raises(KeyError, match=re.escape("('A',)")):
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del df["A"]
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def test_delitem_corner(self, float_frame):
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f = float_frame.copy()
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del f["D"]
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assert len(f.columns) == 3
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with pytest.raises(KeyError, match=r"^'D'$"):
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del f["D"]
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del f["B"]
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assert len(f.columns) == 2
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def test_delitem_col_still_multiindex(self):
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arrays = [["a", "b", "c", "top"], ["", "", "", "OD"], ["", "", "", "wx"]]
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tuples = sorted(zip(*arrays))
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index = MultiIndex.from_tuples(tuples)
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df = DataFrame(np.random.randn(3, 4), columns=index)
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del df[("a", "", "")]
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assert isinstance(df.columns, MultiIndex)
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