title: list extracted from dataframe column recognized as string
body: <p>I have a <code>dataframe</code> with list in one column(or more than one column). My goal is to iterate through those lists in the <code>dataframe</code> column and to print the values in separate rows. </p>
  
  <p><img src="https://i.stack.imgur.com/eBby6.png" alt="dataframe"></p>
  
  <p>The problem is that when I try to iterate through list which is in frameLen:</p>
  
  <pre><code>for index, row in data.iterrows():
      for i in row['frameLen']:
          print(i)
  </code></pre>
  
  <p>I get some weird result :</p>
  
  <pre><code>[
  8
  0
  ,
  
  8
  0
  ,
  
  8
  0
  ,
  
  8
  0
  ,
  
  8
  0
  ,
  
  8
  0
  ]
  </code></pre>
  
  <p>It seems like my list is interpreted as string. </p>
  
  <p>Could someone tell me why is that and what could I do to fix it?</p>
  
  <p>Many thanks :)</p>