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39 lines
1023 B
39 lines
1023 B
import pytest
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from pandas import (
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DataFrame,
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Series,
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)
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import pandas._testing as tm
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class TestPipe:
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def test_pipe(self, frame_or_series):
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obj = DataFrame({"A": [1, 2, 3]})
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expected = DataFrame({"A": [1, 4, 9]})
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if frame_or_series is Series:
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obj = obj["A"]
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expected = expected["A"]
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f = lambda x, y: x**y
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result = obj.pipe(f, 2)
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tm.assert_equal(result, expected)
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def test_pipe_tuple(self, frame_or_series):
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obj = DataFrame({"A": [1, 2, 3]})
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obj = tm.get_obj(obj, frame_or_series)
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f = lambda x, y: y
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result = obj.pipe((f, "y"), 0)
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tm.assert_equal(result, obj)
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def test_pipe_tuple_error(self, frame_or_series):
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obj = DataFrame({"A": [1, 2, 3]})
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obj = tm.get_obj(obj, frame_or_series)
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f = lambda x, y: y
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msg = "y is both the pipe target and a keyword argument"
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with pytest.raises(ValueError, match=msg):
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obj.pipe((f, "y"), x=1, y=0)
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