title: Python for-loop without index and item
body: <p>Is it possible in python to have a for-loop without index and item?
  I have something like the following:</p>
  
  <pre><code>list_1 = []
  for i in range(5):
      list_1.append(3)
  </code></pre>
  
  <p>The code above works fine, but is not nice according to the pep8 coding guidelines. 
  It says: "Unused variable 'i'". </p>
  
  <p>Is there a way to make a for-loop (no while-loop) without having neither the index nor the item? Or should I ignore the coding guidelines?</p>