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