Pandas, groupby and count

Question

I have a dataframe say like this

>>> df = pd.DataFrame({\'user_id\':[\'a\',\'a\',\'s\',\'s\',\'s\'],
                    \'session\':[4,5,4,5,5],
           


        

Answer 1

You seem to want to group by several columns at once:

df.groupby(['revenue','session','user_id'])['user_id'].count()

should give you what you want