title: TypeError: object of type 'map' has no len() #4
body: <p>Can anyone help please , here is the erreur code : TypeError: object of type 'map' has no len() #4</p>
  <pre><code>entropy = (map(lambda x: x.get_entropy(), pe.sections))
  res['SectionsMeanEntropy'] = sum(entropy) /  float(len(list(entropy)))
  </code></pre>