title: How to create a single list from rows of lists?
body: <p>I have a dataframe where one of my columns includes rows of lists. </p>
  
  <p>Each individual row in my column is a list of elements. </p>
  
  <p>I want to create ONE list that includes all the values from each row. </p>
  
  <p>I have tried </p>
  
  <pre><code>final_list = list(itertools.chain.from_iterable(mylist)) 
  </code></pre>
  
  <p>but this keeps each row has a list. </p>
  
  <p>The total length of all of my rows is <code>1981</code>. 
  When I check for final_list it still has a length of <code>1981</code> which is wrong because each row has multiple elements in the lists.</p>
  
  <p>I expect for the length of my final_list to have each row's list elements.</p>