python子类重写父类的抽象方法

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# 如何去模拟一个抽象基类
# class CacheBase():
#     def get(self, key):
#         raise NotImplementedError
#
#     def set(self, key, value):
#         raise NotImplementedError
#
#
# class RedisCache(CacheBase):
#     def set(self, key, value):
#         print(111)
#
#
# redis_cache = RedisCache()
# redis_cache.set("key", "value")

# 如果子类没有重写父类的抽象方法，在初始化的时候就报错
import abc
class CacheBase(metaclass=abc.ABCMeta):
    @abc.abstractmethod
    def get(self, key):
        pass

    @abc.abstractmethod
    def set(self, key, value):
        pass


# class RedisCache(CacheBase):  # TypeError: Can't instantiate abstract class RedisCache with abstract methods get, set
#     pass

class RedisCache(CacheBase):  # TypeError: Can't instantiate abstract class RedisCache with abstract methods get, set
    def set(self, key, value):
        pass
        print(111)
    def get(self, key):
        pass


redis_cache = RedisCache()
redis_cache.set("key", "value")

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