title: Count characters with a list within a list from a csv file
body: <p>I have a csv file when read in the shell looks like </p>
  
  <p><code>data = [['Jack'],['Jill'],['Jane']]</code> </p>
  
  <p>I am trying to count the number of characters for each name and output to <code>[4,4,4]</code>. I have tried <code>[len(i) for i in data]</code> but it returns <code>[1,1,1]</code>.</p>