title: python, storing dictionaries inside a dataframe
body: <p>I've built a pandas dataframe which is storing a simple dictionary in each cell. For example:</p>
  
  <pre><code>{'Sales':0,'Revenue':0}
  </code></pre>
  
  <p>I can retrieve a specific value from the dataframe via:</p>
  
  <pre><code>df[columnA][index100]['Revenue']
  </code></pre>
  
  <p>But now I'd like to plot a graph of all the Revenue values from the dictionaries in <code>columnA</code> - what is the best way of achieving this?</p>
  
  <p>Would life be easier in the long run if I dropped the dictionaries and instead used two identically sized dataframes?  (Am very new to pandas so not sure of best practice).</p>