title: Test if one OR an other substring is in a string, in a DRY way
body: <p>I'm a newbie in python, and try to grab the 'spirit' of it.<br>
  Simple question :<br>
  I want to test if either <code>'a'</code> or <code>'b'</code> are in a string <code>'xxxxxbxxxxx'</code><br>
  I obvisouly could do </p>
  
  <pre><code>full_string = 'xxxxxbxxxxx'
  if 'a' in full_string or 'b' in full_string :  
      print 'found'
  </code></pre>
  
  <p>but I feel there is a more simple way to do it "python style", without repeating <code>full_string</code> , what could be it ? </p>