title: Plot with seaborn after groupby command in pandas
body: <p>I have grouped a list using pandas and I'm trying to plot follwing table with seaborn:</p>
  
  <pre><code>     B  
  A           
  bar  3  
  foo  5  
  </code></pre>
  
  <p>The code <code>sns.countplot(x='A', data=df)</code> does not work <code>(ValueError: Could not interpret input 'A')</code>.</p>
  
  <p>I could just use <code>df.plot(kind='bar')</code> but I would like to know if it is possible to plot with seaborn.</p>