title: The for loop with letters instead of numbers
body: <p>i know the for loop:</p>
  
  <pre><code>    for i range(2, 6):
          print i
  </code></pre>
  
  <p>gives this output:</p>
  
  <pre><code>    2
      3
      4
      5
  </code></pre>
  
  <p>can i also do this somehow with letters?
  for example:</p>
  
  <pre><code>    # an example for what i'm looking for
      for i in range(c, h):
          print i
  
  
      c
      d
      f
      g
  </code></pre>