title: OR statement handling two != clauses Python
body: <p>(Using Python 2.7) I understand this is pretty elementary but why wouldn't the following statement work as written:</p>
  
  <pre><code>input = int(raw_input())
  while input != 10 or input != 20:
      print 'Incorrect value, try again'
      bet = int(raw_input())
  </code></pre>
  
  <p>Basically I only want to accept 10 or 20 as an answer. Now, regardless of 'input', even 10, or 20, I get 'Incorrect value'. Are these clauses self conflicting? I thought that the OR statement would say OK as long as one of the clauses was correct. Thanks!</p>