Turn Pandas DataFrame of strings into histogram

Question

Suppose I have a DataFrame of created like this:

import pandas as pd
s1 = pd.Series([\'a\', \'b\', \'a\', \'c\', \'a\', \'b\'])
s2 = pd.Series([\'a\', \'f\',         


        

Answer 1

You can use pd.value_counts (value_counts is also a series method):

In [20]: d.apply(pd.value_counts)
Out[20]: 
   s1  s2
a   3   3
b   2 NaN
c   1 NaN
d NaN   1
f NaN   3

and than plot the resulting DataFrame.