96 lines
2.7 KiB
Python
96 lines
2.7 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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from pandas.core.reshape.merge import MergeError, merge
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@pytest.mark.parametrize(
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("input_col", "output_cols"), [("b", ["a", "b"]), ("a", ["a_x", "a_y"])]
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)
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def test_merge_cross(input_col, output_cols):
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# GH#5401
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left = DataFrame({"a": [1, 3]})
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right = DataFrame({input_col: [3, 4]})
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left_copy = left.copy()
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right_copy = right.copy()
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result = merge(left, right, how="cross")
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expected = DataFrame({output_cols[0]: [1, 1, 3, 3], output_cols[1]: [3, 4, 3, 4]})
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tm.assert_frame_equal(result, expected)
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tm.assert_frame_equal(left, left_copy)
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tm.assert_frame_equal(right, right_copy)
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@pytest.mark.parametrize(
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"kwargs",
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[
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{"left_index": True},
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{"right_index": True},
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{"on": "a"},
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{"left_on": "a"},
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{"right_on": "b"},
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],
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)
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def test_merge_cross_error_reporting(kwargs):
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# GH#5401
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left = DataFrame({"a": [1, 3]})
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right = DataFrame({"b": [3, 4]})
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msg = (
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"Can not pass on, right_on, left_on or set right_index=True or "
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"left_index=True"
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)
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with pytest.raises(MergeError, match=msg):
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merge(left, right, how="cross", **kwargs)
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def test_merge_cross_mixed_dtypes():
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# GH#5401
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left = DataFrame(["a", "b", "c"], columns=["A"])
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right = DataFrame(range(2), columns=["B"])
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result = merge(left, right, how="cross")
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expected = DataFrame({"A": ["a", "a", "b", "b", "c", "c"], "B": [0, 1, 0, 1, 0, 1]})
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tm.assert_frame_equal(result, expected)
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def test_merge_cross_more_than_one_column():
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# GH#5401
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left = DataFrame({"A": list("ab"), "B": [2, 1]})
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right = DataFrame({"C": range(2), "D": range(4, 6)})
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result = merge(left, right, how="cross")
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expected = DataFrame(
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{
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"A": ["a", "a", "b", "b"],
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"B": [2, 2, 1, 1],
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"C": [0, 1, 0, 1],
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"D": [4, 5, 4, 5],
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}
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)
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tm.assert_frame_equal(result, expected)
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def test_merge_cross_null_values(nulls_fixture):
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# GH#5401
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left = DataFrame({"a": [1, nulls_fixture]})
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right = DataFrame({"b": ["a", "b"], "c": [1.0, 2.0]})
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result = merge(left, right, how="cross")
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expected = DataFrame(
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{
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"a": [1, 1, nulls_fixture, nulls_fixture],
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"b": ["a", "b", "a", "b"],
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"c": [1.0, 2.0, 1.0, 2.0],
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}
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)
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tm.assert_frame_equal(result, expected)
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def test_join_cross_error_reporting():
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# GH#5401
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left = DataFrame({"a": [1, 3]})
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right = DataFrame({"a": [3, 4]})
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msg = (
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"Can not pass on, right_on, left_on or set right_index=True or "
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"left_index=True"
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)
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with pytest.raises(MergeError, match=msg):
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left.join(right, how="cross", on="a")
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