title: Closing DictReader necessary or possible?
body: <pre><code>filenames = glob('directory*.csv')   
  
  for filename in filenames:
     f = csv.DictReader(open(filename))
     #code
  
  f.close()
  </code></pre>
  
  <p>Hello. I'm not entirely familiar with <code>DictReader</code>. </p>
  
  <p>Does this need to be closed after use? i.e. <code>f.close()</code></p>