如何强制python中的字典拒绝现有键的更新？ [英] How can I force a dictionary in python to reject updates of existing keys?

问题描述

是否可以用Python设计字典，如果错误地添加了字典中已经存在的键，该字典将被拒绝吗？
谢谢

Is it possible to design a dictionary in Python in a way that if by mistake a key which is already in the dictionary is added, it gets rejected? thanks

推荐答案

您始终可以创建自己的字典

You can always create your own dictionary

class UniqueDict(dict):
    def __setitem__(self, key, value):
        if key not in self:
            dict.__setitem__(self, key, value)
        else:
            raise KeyError("Key already exists")

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