title: Convert int to ASCII and back in Python
body: <p>I'm working on making a URL shortener for my site, and my current plan (I'm open to suggestions) is to use a node ID to generate the shortened URL. So, in theory, node 26 might be <code>short.com/z</code>, node 1 might be <code>short.com/a</code>, node 52 might be <code>short.com/Z</code>, and node 104 might be <code>short.com/ZZ</code>. When a user goes to that URL, I need to reverse the process (obviously).</p>
  
  <p>I can think of some kludgy ways to go about this, but I'm guessing there are better ones. Any suggestions?</p>