title: "x not in" vs. "not x in"
body: <p>I've noticed that both of these work the same:</p>
  
  <p><code>if x not in list</code> and <code>if not x in list</code>.</p>
  
  <p>Is there some sort of difference between the two in certain cases? Is there a reason for having both, or is it just because it's more natural for some people to write one or the other?</p>
  
  <p>Which one am I more likely to see in other people's code?</p>