'''
多态：同一种事物的多种形态
'''
# import abc
# class Animal(metaclass=abc.ABCMeta):
# @abc.abstractmethod
# def speak(self):
# pass
# class Pig(Animal):
# def speak(self):
# print('哼哼')
# class Dog(Animal):
# def speak(self):
# print('汪汪')
# class People(Animal):
# def speak(self):
# print('hello')
#
# people1=People()
# dog1=Dog()
# pig1=Pig()
'''
多态性：在不考虑对象具体类型的情况下，直接使用对象
'''
# people1.speak()
# dog1.speak()
# pig1.speak()
'''
hello
汪汪
哼哼
'''
# def talk(obj):
# obj.speak()
# talk(people1)
# talk(pig1)
# talk(dog1)
'''
hello
哼哼
汪汪
'''
# l=list([1,2,3])
# s=str('hello')
# t=tuple((1,'a',3,'b',5,'c'))
# l.__len__()
# s.__len__()
# t.__len__()
# print(len(l))
# print(len(s))
# print(len(t))
'''
3
5
6
'''
