37 lines
1.2 KiB
Python
37 lines
1.2 KiB
Python
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import pytest
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from pandas import DataFrame
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import pandas._testing as tm
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class TestSwaplevel:
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def test_swaplevel(self, multiindex_dataframe_random_data):
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frame = multiindex_dataframe_random_data
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swapped = frame["A"].swaplevel()
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swapped2 = frame["A"].swaplevel(0)
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swapped3 = frame["A"].swaplevel(0, 1)
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swapped4 = frame["A"].swaplevel("first", "second")
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assert not swapped.index.equals(frame.index)
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tm.assert_series_equal(swapped, swapped2)
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tm.assert_series_equal(swapped, swapped3)
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tm.assert_series_equal(swapped, swapped4)
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back = swapped.swaplevel()
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back2 = swapped.swaplevel(0)
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back3 = swapped.swaplevel(0, 1)
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back4 = swapped.swaplevel("second", "first")
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assert back.index.equals(frame.index)
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tm.assert_series_equal(back, back2)
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tm.assert_series_equal(back, back3)
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tm.assert_series_equal(back, back4)
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ft = frame.T
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swapped = ft.swaplevel("first", "second", axis=1)
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exp = frame.swaplevel("first", "second").T
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tm.assert_frame_equal(swapped, exp)
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msg = "Can only swap levels on a hierarchical axis."
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with pytest.raises(TypeError, match=msg):
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DataFrame(range(3)).swaplevel()
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