title: String object cannot be interprested as an integer
body: <pre><code>l = 'ABCDEFGHIJK'
  
  def a(l):
      letters = [letter for letter in l]
      print(letters)
  </code></pre>
  <p>Hi, how can I achieve the Output to be ['C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K']? that is, starting at index 2 and finishing at the last index of l?</p>
  <p>More complicatedly, how can I get this Output? ['C', 'D', 'E', 'H', 'I', 'J', 'K']? That is, start at index 2 of l, if 'F' is found jump until 'H' is found.</p>
  <p>Many thanks</p>