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import pytest from pandas import ( DataFrame, Series, ) import pandas._testing as tm class TestPipe: def test_pipe(self, frame_or_series): obj = DataFrame({"A": [1, 2, 3]}) expected = DataFrame({"A": [1, 4, 9]}) if frame_or_series is Series: obj = obj["A"] expected = expected["A"] f = lambda x, y: x ** y result = obj.pipe(f, 2) tm.assert_equal(result, expected) def test_pipe_tuple(self, frame_or_series): obj = DataFrame({"A": [1, 2, 3]}) if frame_or_series is Series: obj = obj["A"] f = lambda x, y: y result = obj.pipe((f, "y"), 0) tm.assert_equal(result, obj) def test_pipe_tuple_error(self, frame_or_series): obj = DataFrame({"A": [1, 2, 3]}) if frame_or_series is Series: obj = obj["A"] f = lambda x, y: y msg = "y is both the pipe target and a keyword argument" with pytest.raises(ValueError, match=msg): obj.pipe((f, "y"), x=1, y=0)
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