title: converting NavigableString to unicode string
body: <p>When I run the following code:</p>
  
  <p><code>if substr in movie.lowercase:</code></p>
  
  <p>I get the following error</p>
  
  <p><code>AttributeError: 'NavigableString' object has no attribute 'lowercase'</code></p>
  
  <p><code>movie</code> is from here:</p>
  
  <p><code>movie = row.td.div.h4.string</code></p>
  
  <p>I tried to change it to (without success)</p>
  
  <p><code>movie = row.td.div.h4.string.string</code></p>
  
  <p>or</p>
  
  <p><code>movie = unicode(row.td.div.h4.string)</code></p>
  
  <p>Do you know how to convert NavigableString to normal unicode string with <code>lowercase</code> method?</p>