title: What does rtype mean in Python?
body: <p>When I do some code tests, there are some comments below the solution function like this:</p>
  
  <pre><code>"""
  :type x: int
  :rtype: int
  """
  </code></pre>
  
  <p><code>x</code> is my only input, so what does <em>rtype</em> stand for?</p>