How should i understand built-in function bin(x)?
<blockquote>
  <p><a href="http://docs.python.org/library/functions.html#bin" rel="nofollow"><strong><code>bin(x)</code></strong></a></p>
  
  <p>Convert an integer number to a binary string. The result is a valid Python expression. If <code>x</code> is not a Python int object, it has to define an <code>__index__()</code> method that returns an integer.</p>
</blockquote>

<p>So if i want to get <code>bin</code> from <code>Cadilac</code> what should i do with this string and <code>__index__()</code> method? How to syntaticly proper compose them?</p>
