python -- point

point.py

class Point(object):

    __slots__ = ('x', 'y')

    def __init__(self, x=0, y=0):
        self.x = x
        self.y = y

    def __setattr__(self, name, value):
        # print self, name, value
        return super(Point, self).__setattr__(name, value)

    def __getitem__(self, index):
        return self.__getattribute__(self.__slots__[index])

    def __setitem__(self, index, value):
        self.__setattr__(self.__slots__[index], value)

    def __len__(self):
        return 2

    def __iter__(self):
        return iter([self.x, self.y])

p = Point()
p[0] = 2
print len(p)

for pp in p:
    print pp

Python for Point(x,y) class