python——实现自定义序列

最新推荐文章于 2024-08-24 17:00:29 发布

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class IntDic:
    def __init__(self):
        #字典
        self.__date={}
    def __len__(self):
        return len(list(self.__date.values()))
    def __getitem__(self,key):
        if key in self.__date:
            return self.__date[key]
        return None

    def __setitem__(self,key,value):
        if not isinstance(value,int):
            raise TypeError("必须是整数")
        self.__date[key] = value

    def __delitem__(self,key):
        if key in self.__date:del self.__date[key]

dic =IntDic()

print(len(dic))
dic['a'] = 1
dic['b'] = 2

print(len(dic))
dic['a'] = 3
dic['c'] = 4

print(dic['a'])
del dic['a']
print(dic['a'])