pandas groupby max multiple columns in pandas

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Eleonora
27 Jan 2016
1annotations.groupby(['bookid','conceptid'], sort=False)['weight'].max()
2
source
Mads
08 May 2020
1In [11]: df.groupby(['col5', 'col2']).size()
2Out[11]:
3col5  col2
41     A       1
5      D       3
62     B       2
73     A       3
8      C       1
94     B       1
105     B       2
116     B       1
12dtype: int64
13
source
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