title: Is there a standard way to specify the type of a callback function in a docstring?
body: <p>I have a function which accepts a callback. Is there a standard way to document the type of this parameter?</p>
  
  <pre><code>def example(callback):
      """Example function.
  
      Parameters
      ----------
      callback : type
         Description of `callback`.
      """
      print(callback(3, 14))
  </code></pre>