skeleton class needs working instantiation guard

[hshivaraj]

Just raise an exception, like so

class Point:
 
    def __init__(self, x, y, z):
        self.x = x
        self.y = y
        self.z = z
 
    @property
    def x(self):
        return self.__x
 
    @x.setter
    def x(self, a):
        if isinstance(a, int):
            self.__x = a
        else:
            raise AttributeError("x must be an integer")
 
    @property
    def y(self):
        return self.__y
 
    @y.setter
    def y(self, b):
        if isinstance(b, int):
            self.__y = b
        else:
            raise AttributeError("y must be an integer")
 
    @property
    def z(self):
        return self.__z
 
    @z.setter
    def z(self, c):
        if isinstance(c, int):
            self.__z = c
        else:
            raise AttributeError("z must be an integer")

p = Point(1, 2, 3.5)