title: How to plot frequency count of pandas column
body: <p>I have a pandas dataframe like this:</p>
  
  <pre><code>    Year   Winner
  4   1954  Germany
  9   1974  Germany
  13  1990  Germany
  19  2014  Germany
  5   1958   Brazil
  6   1962   Brazil
  8   1970   Brazil
  14  1994   Brazil
  16  2002   Brazil
  </code></pre>
  
  <p>How to plot the frequency count of column Winner, so that y axis has frequency and x-axis has name of country?</p>
  
  <p>I tried:</p>
  
  <pre><code>import numpy as np
  import pandas as pd
  
  df.groupby('Winner').size().plot.hist()
  df1['Winner'].value_counts().plot.hist()
  </code></pre>