title: Sublists in pandas
body: <p>I've got a Pandas DataFrame, one of the columns of which looks like this:</p>
  
  <pre><code>0              {u'funny': 2, u'useful': 0, u'cool': 0}
  1        {u'funny': 370, u'useful': 487, u'cool': 296}
  2             {u'funny': 2, u'useful': 17, u'cool': 1}
  3     {u'funny': 1233, u'useful': 2452, u'cool': 1875}
  4              {u'funny': 4, u'useful': 7, u'cool': 2}
  5        {u'funny': 408, u'useful': 819, u'cool': 557}
  6        {u'funny': 321, u'useful': 673, u'cool': 430}
  7           NaN
  8              {u'funny': 0, u'useful': 8, u'cool': 0}
  </code></pre>
  
  <p>I want to break this column out into separate columns, without iterating over all of the rows explicitly (there are a lot, plus it's bad practice).</p>
  
  <p><code>DataFrame.ThisColumn[1]["funny"]</code> returns 2, but <code>DataFrame.ThisColumn[:]["funny"]</code> doesn't work....</p>
  
  <p>How can I break this into separate columns?</p>
  
  <p>Thanks.</p>