class Vector(object):
    __slots__ = ['__data']
    def __init__(self, x=0.0, y=0.0, z=0.0):
#        self.__data = [x, y, z]
        self.__data = [x, y, 0]            # ignore z for now

    def __getitem__(self, index):
        if index >= 0 and index <= 3:
            return self.__data[index]
        else:
            raise Exception("Invalid vector index to get")

    def __setitem__(self, index, val):
        if index >= 0 and index <= 3:
            self.__data[index] = val
        else:
            raise Exception("Invalid vector index to set")

    def __add__(self, other):
        Vector(map(lambda x, y: x+y, self, other))

    def __sub__(self, other):
        Vector(map(lambda x, y: x-y, self, other))

    def __mul__(self, val):
        print val.__type__
        return Vector(self.__data[0]*val, self.__data[1]*val, self.__data[2]*val)

    def __div__(self, val):
        return Vector(self.__data[0]/val, self.__data[1]/val, self.__data[2]/val)

    def __iadd__(self, other):
        self.__data[0] += other[0]
        self.__data[1] += other[1]
        self.__data[2] += other[2]
        return self

    def __isub__(self, other):
        self.__data[0] -= other[0]
        self.__data[1] -= other[1]
        self.__data[2] -= other[2]
        return self

    def __imul__(self, val):
        self.__data[0] *= val
        self.__data[1] *= val
        self.__data[2] *= val
        return self

    def __idiv__(self, val):
        self.__data[0] /= val
        self.__data[1] /= val
        self.__data[2] /= val
        return self

    def __repr__(self):
        return "<Vector [%.2f %.2f %.2f]>" % (self.__data[0], self.__data[1], self.__data[2])

    def __str__(self):
        return "<Vector [%.2f %.2f %.2f]>" % (self.__data[0], self.__data[1], self.__data[2])

    def getLength(self):
        return (self.__data[0]**2 + self.__data[1]**2 + self.__data[2]**2)**0.5

    def distanceToCoords(self, x, y, z):
        return ((self.__data[0] - x)**2 + (self.__data[1] - y)**2 + (self.__data[2] - z)**2)**0.5

    def distanceToVector(self, vec):
        return ((self.__data[0] - vec[0])**2 + (self.__data[1] - vec[1])**2 + (self.__data[2] - vec[2])**2)**0.5

    def getCoords(self):
        return self.__data