title: Docstrings when nothing is returned
body: <p>What is the docstring convention when a function doesn't return anything?</p>
  
  <p>For example:</p>
  
  <pre><code>def f(x):
      """Prints the element given as input
  
      Args:
          x: any element
      Returns:
      """
      print "your input is %s" % x
      return
  </code></pre>
  
  <p>What should I add after <code>Returns:</code> in the docstring? Nothing as it is now?</p>