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Test that using a tuple or list for parameter ascending of sort_index is the same #43963

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Merged
merged 3 commits into from
Oct 16, 2021
Merged

Test that using a tuple or list for parameter ascending of sort_index is the same #43963

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TST: ensure that using a tuple for 'parameter' of 'ascending' is equa…
fandreuz Oct 10, 2021
adcf2eb
clean test after review
fandreuz Oct 12, 2021
fcb9850
TST: add same parametrization as a list
fandreuz Oct 14, 2021
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42 changes: 42 additions & 0 deletions pandas/tests/frame/methods/test_sort_index.py
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Original file line number Diff line number Diff line change
Expand Up @@ -785,6 +785,48 @@ def test_sort_index_use_inf_as_na(self):
result = expected.sort_index()
tm.assert_frame_equal(result, expected)

@pytest.mark.parametrize(
"ascending",
[(True, False), [True, False]],
)
def test_sort_index_ascending_tuple(self, ascending):
df = DataFrame(
{
"legs": [4, 2, 4, 2, 2],
},
index=MultiIndex.from_tuples(
[
("mammal", "dog"),
("bird", "duck"),
("mammal", "horse"),
("bird", "penguin"),
("mammal", "kangaroo"),
],
names=["class", "animal"],
),
)

# parameter `ascending`` is a tuple
result = df.sort_index(level=(0, 1), ascending=ascending)

expected = DataFrame(
{
"legs": [2, 2, 2, 4, 4],
},
index=MultiIndex.from_tuples(
[
("bird", "penguin"),
("bird", "duck"),
("mammal", "kangaroo"),
("mammal", "horse"),
("mammal", "dog"),
],
names=["class", "animal"],
),
)

tm.assert_frame_equal(result, expected)


class TestDataFrameSortIndexKey:
def test_sort_multi_index_key(self):
Expand Down