import numpy as np
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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 TestSwapAxes:
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def test_swapaxes(self):
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df = DataFrame(np.random.default_rng(2).standard_normal((10, 5)))
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msg = "'DataFrame.swapaxes' is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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tm.assert_frame_equal(df.T, df.swapaxes(0, 1))
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tm.assert_frame_equal(df.T, df.swapaxes(1, 0))
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def test_swapaxes_noop(self):
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df = DataFrame(np.random.default_rng(2).standard_normal((10, 5)))
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msg = "'DataFrame.swapaxes' is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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tm.assert_frame_equal(df, df.swapaxes(0, 0))
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def test_swapaxes_invalid_axis(self):
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df = DataFrame(np.random.default_rng(2).standard_normal((10, 5)))
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msg = "'DataFrame.swapaxes' is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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msg = "No axis named 2 for object type DataFrame"
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with pytest.raises(ValueError, match=msg):
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df.swapaxes(2, 5)
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def test_round_empty_not_input(self):
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# GH#51032
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df = DataFrame({"a": [1, 2]})
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msg = "'DataFrame.swapaxes' is deprecated"
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with tm.assert_produces_warning(FutureWarning, match=msg):
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result = df.swapaxes("index", "index")
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tm.assert_frame_equal(df, result)
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assert df is not result
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