title: Is there a way to check if an item exists in a Python tuple?
body: <p>I have seen an <code>index</code> function but it says it errors out if it can't find it. Is there a simple way to just check if the item exists? I just want to get a boolean value of the result so like:</p>
  
  <pre><code>if tuple.exists("item"):
      print "it exists"
  </code></pre>