多态: 对不同类型的对象执行相同的操作

    1. class Dog(object):
    2.     def set_name(self,name):
    3.         self.name=name
    4.     def greet(self):
    5.         print("{}: Wang Wang!".format(self.name))
    7. class Human(object):
    8.     def set_name(self,name):
    9.         self.name=name
    10.     def greet(self):
    11.         print("{}: Hello, world!".format(self.name))
    14. >>> dog=Dog()
    15. >>> dog.set_name("Old Black")
    16. >>> dog.greet()
    17. Old Black: Wang Wang!
    19. >>> man=Human()
    20. >>> man.set_name("Zhang San")
    21. >>> man.greet()
    22. Zhang San: Hello, world!