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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]})
obj = tm.get_obj(obj, frame_or_series)
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]})
obj = tm.get_obj(obj, frame_or_series)
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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