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)

Answer 2

Pandas stacked bar chart relies on plotting different columns, so you'd need to pivot your data table to get the queries as columns holding the number of queries in rows.

Try this:

df = pd.DataFrame({"session":[1,1,2,2,3,3],
              "query":list("ababab"), "count":[5,7,32,5,8,1]})
df.pivot("session","query").plot(kind="bar", stacked=True)

Output: