117 lines
3.6 KiB
Python
117 lines
3.6 KiB
Python
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import numpy as np
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import pytest
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import pandas as pd
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import pandas._testing as tm
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@pytest.mark.parametrize("align_axis", [0, 1, "index", "columns"])
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def test_compare_axis(align_axis):
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# GH#30429
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s1 = pd.Series(["a", "b", "c"])
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s2 = pd.Series(["x", "b", "z"])
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result = s1.compare(s2, align_axis=align_axis)
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if align_axis in (1, "columns"):
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indices = pd.Index([0, 2])
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columns = pd.Index(["self", "other"])
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expected = pd.DataFrame(
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[["a", "x"], ["c", "z"]], index=indices, columns=columns
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)
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tm.assert_frame_equal(result, expected)
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else:
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indices = pd.MultiIndex.from_product([[0, 2], ["self", "other"]])
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expected = pd.Series(["a", "x", "c", "z"], index=indices)
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize(
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"keep_shape, keep_equal",
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[
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(True, False),
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(False, True),
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(True, True),
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# False, False case is already covered in test_compare_axis
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],
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)
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def test_compare_various_formats(keep_shape, keep_equal):
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s1 = pd.Series(["a", "b", "c"])
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s2 = pd.Series(["x", "b", "z"])
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result = s1.compare(s2, keep_shape=keep_shape, keep_equal=keep_equal)
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if keep_shape:
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indices = pd.Index([0, 1, 2])
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columns = pd.Index(["self", "other"])
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if keep_equal:
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expected = pd.DataFrame(
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[["a", "x"], ["b", "b"], ["c", "z"]], index=indices, columns=columns
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)
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else:
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expected = pd.DataFrame(
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[["a", "x"], [np.nan, np.nan], ["c", "z"]],
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index=indices,
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columns=columns,
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)
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else:
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indices = pd.Index([0, 2])
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columns = pd.Index(["self", "other"])
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expected = pd.DataFrame(
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[["a", "x"], ["c", "z"]], index=indices, columns=columns
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)
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tm.assert_frame_equal(result, expected)
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def test_compare_with_equal_nulls():
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# We want to make sure two NaNs are considered the same
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# and dropped where applicable
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s1 = pd.Series(["a", "b", np.nan])
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s2 = pd.Series(["x", "b", np.nan])
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result = s1.compare(s2)
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expected = pd.DataFrame([["a", "x"]], columns=["self", "other"])
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tm.assert_frame_equal(result, expected)
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def test_compare_with_non_equal_nulls():
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# We want to make sure the relevant NaNs do not get dropped
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s1 = pd.Series(["a", "b", "c"])
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s2 = pd.Series(["x", "b", np.nan])
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result = s1.compare(s2, align_axis=0)
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indices = pd.MultiIndex.from_product([[0, 2], ["self", "other"]])
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expected = pd.Series(["a", "x", "c", np.nan], index=indices)
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tm.assert_series_equal(result, expected)
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def test_compare_multi_index():
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index = pd.MultiIndex.from_arrays([[0, 0, 1], [0, 1, 2]])
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s1 = pd.Series(["a", "b", "c"], index=index)
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s2 = pd.Series(["x", "b", "z"], index=index)
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result = s1.compare(s2, align_axis=0)
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indices = pd.MultiIndex.from_arrays(
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[[0, 0, 1, 1], [0, 0, 2, 2], ["self", "other", "self", "other"]]
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)
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expected = pd.Series(["a", "x", "c", "z"], index=indices)
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tm.assert_series_equal(result, expected)
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def test_compare_unaligned_objects():
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# test Series with different indices
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msg = "Can only compare identically-labeled Series objects"
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with pytest.raises(ValueError, match=msg):
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ser1 = pd.Series([1, 2, 3], index=["a", "b", "c"])
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ser2 = pd.Series([1, 2, 3], index=["a", "b", "d"])
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ser1.compare(ser2)
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# test Series with different lengths
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msg = "Can only compare identically-labeled Series objects"
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with pytest.raises(ValueError, match=msg):
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ser1 = pd.Series([1, 2, 3])
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ser2 = pd.Series([1, 2, 3, 4])
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ser1.compare(ser2)
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