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TST: avoid sort when concat int-index Dataframes with sort=False #47685

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Merged
merged 3 commits into from
Jul 12, 2022
Merged

TST: avoid sort when concat int-index Dataframes with sort=False #47685

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d1c47b6
Update test_sort.py
GYHHAHA Jul 12, 2022
852e289
Update test_sort.py
GYHHAHA Jul 12, 2022
e988e09
add assert
GYHHAHA Jul 12, 2022
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16 changes: 16 additions & 0 deletions pandas/tests/reshape/concat/test_sort.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,22 @@ def test_concat_frame_with_sort_false(self):

tm.assert_frame_equal(result, expected)

# GH 37937
df1 = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}, index=[1, 2, 3])
df2 = DataFrame({"c": [7, 8, 9], "d": [10, 11, 12]}, index=[3, 1, 6])
result = pd.concat([df2, df1], axis=1, sort=False)
expected = DataFrame(
[
[7.0, 10.0, 3.0, 6.0],
[8.0, 11.0, 1.0, 4.0],
[9.0, 12.0, np.nan, np.nan],
[np.nan, np.nan, 2.0, 5.0],
],
index=[3, 1, 6, 2],
columns=["c", "d", "a", "b"],
)
tm.assert_frame_equal(result, expected)

def test_concat_sort_none_warning(self):
# GH#41518
df = DataFrame({1: [1, 2], "a": [3, 4]})
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