类型错误 Unhashable type:set [英] Type error Unhashable type:set

问题描述

下面的代码在函数 U=set(p.enum()) 中有一个错误，这是一个不可散列类型的类型错误:'set' 实际上，如果你能看到类方法 enum 返回 'L'，它是集合和函数中的 U 应该是一个集合，所以你能帮我解决这个问题，或者我如何将集合列表转换为集合集合?

The below code has an error in function U=set(p.enum()) which a type error of unhashable type : 'set' actually if you can see the class method enum am returning 'L' which is list of sets and the U in function should be a set so can you please help me to resolve the issue or How can I convert list of sets to set of sets?

class pattern(object):

        def __init__(self,node,sets,cnt):
            self.node=node
            self.sets=sets
            self.cnt=cnt

        def enum(self):
            L=[]
            if self.cnt==1:
                L = self.node
            else:
                for i in self.sets:
                    L=[]
                    for j in self.node:
                        if i!=j:
                            L.append(set([i])|set([j]))

            return L #List of sets              

    V=set([1,2,3,4])
    U=set()
    cnt=1
    for j in V:
        p=pattern(V,(U|set([j])),cnt)
        U=set(p.enum()) #type error Unhashable type:'set'   
        print U
            cnt+=1 

推荐答案

您放入集合中的单个项目不能是可变的，因为如果它们更改，有效散列值将更改，从而能够检查是否包含会崩溃.

The individual items that you put into a set can't be mutable, because if they changed, the effective hash would change and thus the ability to check for inclusion would break down.

相反，您需要将不可变对象放入集合中 - 例如frozensets.

Instead, you need to put immutable objects into a set - e.g. frozensets.

如果您将返回语句从 enum 方法更改为...

If you change the return statement from your enum method to...

return [frozenset(i) for i in L]

...那么它应该可以工作.

...then it should work.

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