title: Make an if/in statement cleaner
body: <p>I am just starting to learn python right now and I came across this exercise.  I found a way to do it but I don't think that it's the best way.  This is what I have right now.</p>
  
  <pre><code>big_string = input("Enter a string of lowercase letters: ")
  
  
  if "a" in big_string or "e" in big_string or "i" in big_string or "o" in big_string or "u" in big_string:
      print "Contains a lowercase vowel!"
  else:
      print "Doesn't contain a lowercase vowel"
  </code></pre>
  
  <p>Is there a better way to do the if/in line?</p>