title: Get the week numbers between two dates with python
body: <p>I'd like to find the most pythonic way to output a list of the week numbers between two dates.</p>
  
  <p>For example:</p>
  
  <p><strong>input</strong></p>
  
  <pre><code>start = datetime.date(2011, 12, 25) 
  end = datetime.date(2012, 1, 21)
  </code></pre>
  
  <p><strong>output</strong></p>
  
  <pre><code>find_weeks(start, end)
  &gt;&gt; [201152, 201201, 201202, 201203]
  </code></pre>
  
  <p>I've been struggling using the datetime library with little success</p>