pandas duplicated

1>>> df.duplicated(subset=['brand'])
20    False
31     True
42    False
53     True
64     True
7dtype: bool
8

1>>> df.duplicated(keep='last')
20     True
31    False
42    False
53    False
64    False
7dtype: bool
8

1>>> df = pd.DataFrame({
2...     'brand': ['Yum Yum', 'Yum Yum', 'Indomie', 'Indomie', 'Indomie'],
3...     'style': ['cup', 'cup', 'cup', 'pack', 'pack'],
4...     'rating': [4, 4, 3.5, 15, 5]
5... })
6>>> df
7    brand style  rating
80  Yum Yum   cup     4.0
91  Yum Yum   cup     4.0
102  Indomie   cup     3.5
113  Indomie  pack    15.0
124  Indomie  pack     5.0
13