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hi, guys i figure it out ... in ros when we initial the parameters, like position2 = Point(), the hash value is change. however, intersection method compare both hash value and it's value, so what we can do is build a new class just compare value without hash value. OR the other method is rebuild the hash value by yourself, such as Ninja Puppy's suggestion:

class NewPoint(Point):
    def __hash__(self):
        return hash(self.x) # maybe self.y as well?

hi, guys i figure it out ... in ros when we initial the parameters, like position2 = Point(), Point() and deepcopy, the hash value is change. however, intersection method compare both hash value and it's value, so what we can do is build a new class just compare value without hash value. OR the other method is rebuild the hash value by yourself, such as Ninja Puppy's suggestion:

class NewPoint(Point):
    def __hash__(self):
        return hash(self.x) # maybe self.y as well?