title: Split an array of strings into a 2d array of characters
body: <p>I am trying to split an array of strings into a 2d array of characters from each string</p>
  
  <pre><code>lines = ['abc','123','ggg']
  list(lines)
  print lines
  #['abc','123','ggg']
  #nothing changed
  #I want [['a','b','c'],['1','2','3'] etc..
  </code></pre>
  
  <p>Whereas with one string,</p>
  
  <pre><code>print list('lala')
  #['l', 'a', 'l', 'a']
  #It works!
  </code></pre>
  
  <p>Thanks</p>