import pytest
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from pandas import Index
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import pandas._testing as tm
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def test_add_prefix_suffix(float_frame):
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with_prefix = float_frame.add_prefix("foo#")
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expected = Index([f"foo#{c}" for c in float_frame.columns])
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tm.assert_index_equal(with_prefix.columns, expected)
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with_suffix = float_frame.add_suffix("#foo")
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expected = Index([f"{c}#foo" for c in float_frame.columns])
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tm.assert_index_equal(with_suffix.columns, expected)
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with_pct_prefix = float_frame.add_prefix("%")
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expected = Index([f"%{c}" for c in float_frame.columns])
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tm.assert_index_equal(with_pct_prefix.columns, expected)
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with_pct_suffix = float_frame.add_suffix("%")
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expected = Index([f"{c}%" for c in float_frame.columns])
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tm.assert_index_equal(with_pct_suffix.columns, expected)
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def test_add_prefix_suffix_axis(float_frame):
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# GH 47819
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with_prefix = float_frame.add_prefix("foo#", axis=0)
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expected = Index([f"foo#{c}" for c in float_frame.index])
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tm.assert_index_equal(with_prefix.index, expected)
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with_prefix = float_frame.add_prefix("foo#", axis=1)
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expected = Index([f"foo#{c}" for c in float_frame.columns])
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tm.assert_index_equal(with_prefix.columns, expected)
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with_pct_suffix = float_frame.add_suffix("#foo", axis=0)
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expected = Index([f"{c}#foo" for c in float_frame.index])
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tm.assert_index_equal(with_pct_suffix.index, expected)
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with_pct_suffix = float_frame.add_suffix("#foo", axis=1)
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expected = Index([f"{c}#foo" for c in float_frame.columns])
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tm.assert_index_equal(with_pct_suffix.columns, expected)
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def test_add_prefix_suffix_invalid_axis(float_frame):
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with pytest.raises(ValueError, match="No axis named 2 for object type DataFrame"):
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float_frame.add_prefix("foo#", axis=2)
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with pytest.raises(ValueError, match="No axis named 2 for object type DataFrame"):
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float_frame.add_suffix("foo#", axis=2)
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