title: Implement list-like index access in Python
body: <p>I'd like to be able to access some values of a python object using array-like syntax, ie:</p>
  
  <pre><code>obj = MyClass()
  zeroth = obj[0]
  first = obj[1]
  </code></pre>
  
  <p>Is this possible? If so, how do you implement this in the python class in question?</p>