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()
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