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TST GH27994 Add test for dropping empty list / index for a DataFrame … #42746

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Merged
merged 5 commits into from Jul 28, 2021
Merged

TST GH27994 Add test for dropping empty list / index for a DataFrame … #42746

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a1f3df4
TST GH27994 Add test for dropping empty list / index for a DataFrame …
Jul 27, 2021
1bbd4c0
TST GH27994 Update new test to reduce rows, safely copy data and use …
Jul 27, 2021
be3bd20
TST GH27994 Update new test to reduce line-breaks for index and re-na…
Jul 27, 2021
8682c36
TST GH27994 Apply black code formatting.
Jul 27, 2021
71f01a8
TST GH27994 Add additional empty list-like objects to test.
Jul 27, 2021
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23 changes: 23 additions & 0 deletions pandas/tests/frame/methods/test_drop.py
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@
import pandas as pd
from pandas import (
DataFrame,
DatetimeIndex,
Index,
MultiIndex,
Series,
Expand Down Expand Up @@ -268,6 +269,28 @@ def test_drop_non_empty_list(self, index, drop_labels):
with pytest.raises(KeyError, match="not found in axis"):
DataFrame(index=index).drop(drop_labels)

@pytest.mark.parametrize(
"empty_listlike",
[
[],
{},
np.array([]),
Series([], dtype="datetime64[ns]"),
Index([]),
DatetimeIndex([]),
],
)
def test_drop_empty_listlike_non_unique_datetime_index(self, empty_listlike):
# GH#27994
data = {"column_a": [5, 10], "column_b": ["one", "two"]}
index = [Timestamp("2021-01-01"), Timestamp("2021-01-01")]
df = DataFrame(data, index=index)

# Passing empty list-like should return the same DataFrame.
expected = df.copy()
result = df.drop(empty_listlike)
tm.assert_frame_equal(result, expected)

def test_mixed_depth_drop(self):
arrays = [
["a", "top", "top", "routine1", "routine1", "routine2"],
Expand Down