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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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24 changes: 24 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 @@ -268,6 +268,30 @@ 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)

def test_drop_empty_listlike_non_unique_datetime_index(self):
# GH#27994
data = {
"column_a": [5, 10, 15, 20, 25],
"column_b": ["one", "two", "three", "four", "five"],
}
index = [
Timestamp("2021-01-01"),
Timestamp("2021-01-01"),
Timestamp("2021-01-01"),
Timestamp("2021-01-01"),
Timestamp("2021-01-01"),
]
df = DataFrame(data, index=index)

# Passing empty list or index should return the same DataFrame.
empty_list = []
empty_datetime_index = df[df["column_a"] > 100].index

for empty_listlike in [empty_list, empty_datetime_index]:
dropped = df.drop(empty_listlike)
expected = df
tm.assert_frame_equal(dropped, expected)

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