title: Access a list within a dataframe pandas
body: <p>I'm working on dataframes with PANDAS in Python. I read a csv file with <code>pandas.read_csv(...)</code>. In this csv file the column <code>'possible_stops'</code> contains lists (each cells in this column looks like : <code>[ ]</code> or <code>[str0,str1]</code>).</p>
  
  <p>I want to iterate over the rows with <code>itertuples()</code> and for each row i want to access the list inside <code>'possible_stops'</code> column. 
  However, the dtype of this column is <code>object</code> and when i look for the type of a specific cell (<code>type(row.possible_stops)</code>) it returns <code>str</code>. I think there is something to do with <code>dtype = ..</code> inside the <code>read_csv</code> method but i don't exactly know what to do. </p>
  
  <p>How can i convert cells inside this column into lists ?</p>
  
  <p>Thanks very much!</p>
  
  <p>EDIT :
  the resulting df looks like :</p>
  
  <pre><code>latitude longitude gps_speed possible_stops    
  1.05869 1574942547  0.0 [['Bapeaume', 2]]
  1.05862 1573910439  0.0 [['Bapeaume', 2]]
  1.05862 1573910441  0.0 [['Bapeaume', 2]]
  1.05862 1573910443  0.0 [['Bapeaume', 2]]
  1.05862 1573910445  0.0 [['Bapeaume', 2]]
  1.05862 1573910447  0.0 [['Bapeaume', 2]]
  </code></pre>