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Oct 29, 2019
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TST: Test named aggregations with functions #29262

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TST: Test named aggregations with functions
gfyoung Oct 29, 2019
f11fcb1
MAINT: Use pytest idiom for added tests
gfyoung Oct 29, 2019
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27 changes: 27 additions & 0 deletions pandas/tests/groupby/aggregate/test_aggregate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -495,6 +495,33 @@ def test_mangled(self):
tm.assert_frame_equal(result, expected)


def myfunc(s):
return np.percentile(s, q=0.90)


@pytest.mark.parametrize("func", [lambda s: np.percentile(s, q=0.90), myfunc])
def test_lambda_named_agg(func):
# see gh-28467
animals = DataFrame(
{
"kind": ["cat", "dog", "cat", "dog"],
"height": [9.1, 6.0, 9.5, 34.0],
"weight": [7.9, 7.5, 9.9, 198.0],
}
)

result = animals.groupby("kind").agg(
mean_height=("height", "mean"), perc90=("height", func)
)
expected = DataFrame(
[[9.3, 9.1036], [20.0, 6.252]],
columns=["mean_height", "perc90"],
index=Index(["cat", "dog"], name="kind"),
)

tm.assert_frame_equal(result, expected)


class TestLambdaMangling:
def test_maybe_mangle_lambdas_passthrough(self):
assert _maybe_mangle_lambdas("mean") == "mean"
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