title: How to delete [NaN] from a list of lists?
body: <p>I have the following </p>
  
  <pre><code>a = [[u'63764'], [u'63764'], [u'63764'], [u'70272'], [u'98362'], [u'NaN'], [u'NaN']]
  </code></pre>
  
  <p>How do I delete all those <code>[NaN]</code>s to get:</p>
  
  <pre><code>a = [[u'63764'], [u'63764'], [u'63764'], [u'70272'], [u'98362']]
  </code></pre>
  
  <p>Thank You</p>