抽象类

# class Animal:
#     def eat(self):
#         pass
#     def run(self):
#         pass
#
# class People(Animal):
#     def eat(self):
#         print('people is eating')
#     def run(self):
#         print('people is running')
# class Pig(Animal):
#     def eat(self):
#         print('pig is eating')
#     def run(self):
#         print('pig is running')
#
# peo1=People()
# pig1=Pig()
#
# peo1.eat()
# pig1.eat()

# import abc
#
# class Animal(metaclass=abc.ABCMeta):
#     @abc.abstractmethod
#     def eat(self):
#         pass
#
#     @abc.abstractmethod
#     def run(self):
#         pass
#
#
# class People(Animal):
#     def eat(self):
#         # print('people is eating')
#         pass
#
#     def run(self):
#         # print('people is running')
#         pass
#
# class Pig(Animal):
#     def eat(self):
#         pass
#
#     def run(self):
#         pass
#
# peo1=People()
# peo1.eat()
#
# pig1=Pig()
# pig1.eat()

# import abc
#
# class File(metaclass=abc.ABCMeta):
#     @abc.abstractmethod
#     def eat(self):
#         pass
#
#     @abc.abstractmethod
#     def run(self):
#         pass
#
# class Disk(File):
#     def read(self):
#         print('disk read')
#     def write(self):
#         print('disk write')
#
# class Process(File):
#     def read(self):
#         print('process read')
#     def write(self):
#         print('process write')
#
# d=Disk()
# p=Process()
#
# d.read()
# d.write()
#
# p.read()
# p.write()