title: Python: split data frame row into multiple rows
body: <p>How can I split column values into many rows ?</p>
  
  <p>For example :</p>
  
  <p>I have the following headers: <code>title, url, body, comments</code>. I scraped this data and  exported it as a csv file. My comment column has more than one comment as shown below :</p>
  
  <pre><code>{'comment': [u'Have you never see Eric Pickles?', u'Looks a bit unrealistic'], 'name': [u'gruniadreader666', u'Dowling1981']}
  </code></pre>
  
  <p>I want each comment to be in its own row.</p>