title: Python unicode list join
body: <p>I want to join a unicode python list, for example:</p>
  
  <pre><code>a = [u'00', u'0c', u'29', u'58', u'86', u'16']
  </code></pre>
  
  <p>I want a string that looks like this:</p>
  
  <pre><code>'00:0c:29:58:86:16'
  </code></pre>
  
  <p>How would I join this?</p>