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TST: Same return values in drop_duplicates for Series and DataFrames(#… #14754

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Dec 15, 2016
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TST: Same return values in drop_duplicates for Series and DataFrames(#… #14754

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15 changes: 15 additions & 0 deletions pandas/tests/test_base.py
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Original file line number Diff line number Diff line change
Expand Up @@ -949,6 +949,21 @@ def test_duplicated_drop_duplicates_index(self):
s.drop_duplicates(inplace=True)
tm.assert_series_equal(s, original)

def test_drop_duplicates_series_vs_dataframe(self):
# GH 14192
df = pd.DataFrame({'a': [1, 1, 1, 'one', 'one'],
'b': [2, 2, np.nan, np.nan, np.nan],
'c': [3, 3, np.nan, np.nan, 'three'],
'd': [1, 2, 3, 4, 4],
'e': [datetime(2015, 1, 1), datetime(2015, 1, 1),
datetime(2015, 2, 1), pd.NaT, pd.NaT]
})
for column in df.columns:
for keep in ['first', 'last', False]:
dropped_frame = df[[column]].drop_duplicates(keep=keep)
dropped_series = df[column].drop_duplicates(keep=keep)
tm.assert_frame_equal(dropped_frame, dropped_series.to_frame())

def test_fillna(self):
# # GH 11343
# though Index.fillna and Series.fillna has separate impl,
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