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TST: added test for fixed bug gh#50372 #54701

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Merged
merged 3 commits into from
Aug 23, 2023
Merged

TST: added test for fixed bug gh#50372 #54701

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f74c27c
added test for bug gh#50372
DRiXD Aug 23, 2023
15c87fd
cleaned code to fit pre-commit
DRiXD Aug 23, 2023
1bdb01b
moved test to better fitting location
DRiXD Aug 23, 2023
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17 changes: 17 additions & 0 deletions pandas/tests/indexing/multiindex/test_getitem.py
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Original file line number Diff line number Diff line change
Expand Up @@ -145,6 +145,23 @@ def test_frame_getitem_simple_key_error(
indexer(df)


def test_tuple_string_column_names():
# GH#50372
mi = MultiIndex.from_tuples([("a", "aa"), ("a", "ab"), ("b", "ba"), ("b", "bb")])
df = DataFrame([range(0, 4), range(1, 5), range(2, 6)], columns=mi)
df["single_index"] = 0

df_flat = df.copy()
df_flat.columns = df_flat.columns.to_flat_index()
df_flat["new_single_index"] = 0

result = df_flat[[("a", "aa"), "new_single_index"]]
expected = DataFrame(
[[0, 0], [1, 0], [2, 0]], columns=Index([("a", "aa"), "new_single_index"])
)
tm.assert_frame_equal(result, expected)


def test_frame_getitem_multicolumn_empty_level():
df = DataFrame({"a": ["1", "2", "3"], "b": ["2", "3", "4"]})
df.columns = [
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