如何测试x是否为通用集的成员? [英] How to test whether x is a member of a universal set?

问题描述

我有一个列表L，如果x是L的成员，则x in L的结果为True.我可以使用什么代替L，以便x in smth单独取决于x的值而得出True?

I have a list L, and x in L evaluates to True if x is a member of L. What can I use instead of L in order x in smth will evaluate to True independently on the value of x?

所以，我需要包含所有对象(包括自身)的东西，因为x也可以是这个"smth".

So, I need something, what contains all objects, including itself, because x can also be this "smth".

推荐答案

class Universe:
    def __contains__(_,x): return True

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