title: retrieving tags from result of POS tagging
body: <p>Using python how to retrieve only the tags - 'NN', 'JJ' etc from</p>
  
  <pre><code>('[', 'NN'), 
  ("u'Tradus-Under", 'NN'), 
  ("'", "''"), 
  (',', ','), 
  ("u'Maintenance", 'JJ'), 
  ("'", "''"), 
  (']', ':')
  </code></pre>
  
  <p>ie. from POS tagging result.</p>