title: How to sort alpha numeric set in python
body: <p>I have a set </p>
  
  <pre><code>set(['booklet', '4 sheets', '48 sheets', '12 sheets'])
  </code></pre>
  
  <p>After sorting I want it to look like </p>
  
  <pre><code>4 sheets,
  12 sheets,
  48 sheets,
  booklet
  </code></pre>
  
  <p>Any idea please</p>