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TST: Test .loc #25548 for matched and unmatched indices of Series #60450

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TST: Test .loc #25548 for matched and unmatched indices of Series #60450

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0f7a548
Added test for .loc to test setitem on matching indices
dshettyepi Nov 29, 2024
5175288
precommit workflow
dshettyepi Nov 29, 2024
021bdba
modified from np.NaN to np.nan
DhruvBShetty Nov 29, 2024
6c6b25f
Merge branch 'pandas-dev:main' into test_loc_feature
DhruvBShetty Dec 7, 2024
968c6f7
formatting fixes
DhruvBShetty Dec 8, 2024
1563568
Merge branch 'main' into test_loc_feature
DhruvBShetty Dec 15, 2024
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19 changes: 19 additions & 0 deletions pandas/tests/indexing/test_loc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3297,3 +3297,22 @@ def test_loc_reindexing_of_empty_index(self):
df.loc[Series([False] * 4, index=df.index, name=0), 0] = df[0]
expected = DataFrame(index=[1, 1, 2, 2], data=["1", "1", "2", "2"])
tm.assert_frame_equal(df, expected)

def test_loc_setitem_matching_index(self, series_with_simple_index):
# GH 25548
ser1 = series_with_simple_index.copy()
ser1 = ser1[~ser1.index.duplicated(keep="first")]
ser2 = ser1.copy()
# Testing on upto 2 indices
for nsize in range(1, min(len(ser1), 3)):
random_sample = ser1.sample(n=nsize)
matching_mask = ser1.index.isin(random_sample.index)
# Remove values at indices to test assignment
ser1.loc[matching_mask] = np.nan
ser1.loc[matching_mask] = random_sample
tm.assert_series_equal(ser1, ser2)
# exclude row and index and test assignment of unmatched indices
exclude_mask = ~matching_mask
ser2.loc[matching_mask] = ser1.loc[exclude_mask]
ser1.loc[matching_mask] = np.nan
tm.assert_series_equal(ser2, ser1)
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