Pandas stacked bar chart

Question

I have the following dataset:

SessionId    Query
   1           a   
   1           b
   2           a
   3           b
   3           b
   3           c
            


        

Answer 1

crosstab should do the job if I understand your question correctly:

import pandas as pd

data = pd.DataFrame({'SessionId': [1, 1, 2, 3, 3, 3, 3], 
                     'Query': ['a', 'b', 'a', 'b', 'b', 'c', 'a']})

pd.crosstab(data.SessionId, data.Query).plot.barh(stacked=True)