title: Counting differences between two strings
body: <p>I'm trying to count the number of differences between two imported strings (seq1 and seq2, import code not listed), but am getting no result when running the program.  I want the output to read something like "2 differences."  Not sure where I'm going wrong...</p>
  
  <pre><code>def difference (seq1, seq2):    
      count = 0
      for i in seq1:
          if seq1[i] != seq2[i]:
              count += 1
          return (count)
      print (count, "differences")
  </code></pre>