title: How to check if a list exists in Python
body: <p>What is the easiest way to check to see if a list or dict exists in python ?</p>
  
  <p>Im using the following but this isn't working:</p>
  
  <pre><code>if len(list) == 0:
      print "Im not here"
  </code></pre>
  
  <p>Thanks,</p>