Python:为什么散列函数不是确定性的?

在这种情况下,可能最容易定义自己的 __eq__ 功能和 __hash__ 功能。这将每次为您返回相同的哈希值:

class Generic:
    def __init__(self, id, name, property):
        self.id=id
        self.name = name
        self.property = property

    def __eq__(self, other):
        assert self.__class__ == other.__class__, "Types do not match"
        return self.id == other.id and self.name == other.name and self.property == other.property

    def __hash__(self):
        return hash ( (self.id, self.name, self.property) )

这还将使等效对象的散列相等,以及:

>>>obj = Generic(1, 'blah', 'blah')
>>>obj2 = Generic(1, 'blah', 'blah')
>>>obj == obj2
True
>>>hash(obj) == hash(obj2)
True

希望能有帮助!