Class Python

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  4. Define abstract class Animal
class Animal:
    def reply(self):   
       self.speak()        
    def speak(self):   
       print 'spam'        
class Mammal(Animal):
    def speak(self):   
      print 'speak?'
class Cat(Mammal):
    def speak(self):   
       print 'Speak from Cat'
class Dog(Mammal):
    def speak(self):   
       print 'Speak from Dog'
class Primate(Mammal):
    def speak(self):   
       print 'Speak from primate!'
class Hacker(Primate): pass     
if __name__ == '__main__':
    spot = Cat()
    spot.reply()        
    data = Hacker()     
    data.reply()