This is the code I made, and it doesn't pass through the solution even though the outputs looks the same

    def intersect(self,other):
        #return [i for i in self.vals if i in other.vals]
        n=intSet()
        for i in self.vals:
            if i in other.vals: n.insert(i)
        return n

This code which is modeled after the solution works fine though

    def intersect(self,other):
        #return [i for i in self.vals if i in other.vals]
        n=intSet()
        for i in self.vals:
            if other.member(i): n.insert(i)
        return n

What's the difference?