title: Python pattern for defaulting to a 'grandparent' class's implementation
body: <pre><code>class Thing(object):
    def sound(self):
      return '' #Silent
  
  class Animal(Thing):
    def sound(self):
      return 'Roar!'
  
  class MuteAnimal(Animal):
     def sound(self):
      return '' #Silent
  </code></pre>
  
  <p>Is there a pattern in python for <code>MuteAnimal</code>'s sound to refer to its grandparent class <code>Thing</code>'s implementation? (eg <code>super(MuteAnimal,self).super(Animal.self).sound()</code> ?) Or is Mixin a better use case here? </p>