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TST: Add regression test for NaN sparse columns #52772

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Merged
merged 2 commits into from
Apr 19, 2023
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TST: Add regression test for NaN sparse columns #52772

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129e5c4
Add test for GH 27781
ConnorMcKinley Apr 19, 2023
0573a79
Modify test for GH 27781
ConnorMcKinley Apr 19, 2023
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12 changes: 12 additions & 0 deletions pandas/tests/arrays/sparse/test_array.py
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Original file line number Diff line number Diff line change
Expand Up @@ -478,3 +478,15 @@ def test_drop_duplicates_fill_value():
result = df.drop_duplicates()
expected = pd.DataFrame({i: SparseArray([0.0], fill_value=0) for i in range(5)})
tm.assert_frame_equal(result, expected)


def test_zero_sparse_column():
# GH 27781
df1 = pd.DataFrame({"A": SparseArray([0, 0, 0]), "B": [1, 2, 3]})
df2 = pd.DataFrame({"A": SparseArray([0, 1, 0]), "B": [1, 2, 3]})
result = df1.loc[df1["B"] != 2]
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Can you also compare this to a manually created dataframe i.e.

expected = pd.DataFrame({...})
tm.assert_frame_equal(result, expected)

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Added it, thanks for the suggestion.

expected = df2.loc[df2["B"] != 2]
tm.assert_frame_equal(result, expected)

expected = pd.DataFrame({"A": SparseArray([0, 0]), "B": [1, 3]}, index=[0, 2])
tm.assert_frame_equal(result, expected)