问题:

class Thing(object):
  def sound(self):
    return '' #Silent

class Animal(Thing):
  def sound(self):
    return 'Roar!'

class MuteAnimal(Animal):
   def sound(self):
    return '' #Silent

Is there a pattern in python for MuteAnimal's sound to refer to its grandparent class Thing's implementation? (eg super(MuteAnimal,self).super(Animal.self).sound() ?) Or is Mixin a better use case here?

回答1:

As said by Alexander Rossa in Python inheritance - how to call grandparent method? :

There are two ways to go around this:

Either you can use explicitly A.foo(self) method as the others have suggested - use this when you want to call the method of the A class with disregard as to whether A is B's parent class or not:
class C(B):   def foo(self):
    tmp = A.foo(self) # call A's foo and store the result to tmp

return "C"+tmp 
Or, if you want to use the .foo() method of B's parent class regardless whether the parent class is A or not, then use:
class C(B):   def foo(self):
    tmp = super(B, self).foo() # call B's father's foo and store the result to tmp
    return "C"+tmp