class Screen(object):
    @property
    def width(self):
        return self.__width

    @width.setter
    def width(self, value):
        if not isinstance(value, (int, float)):
            raise TypeError('Width Error Value Type, Not int or float')
        self.__width = value

    @property
    def height(self):
        return self.__height

    @height.setter
    def height(self, value):
        if not isinstance(value, (int, float)):
            raise TypeError('Height Error Value Type, Not int or float')
        self.__height = value
    
    @property
    def resolution(self):
        return self.height * self.width

    def __str__(self):
        str = super().__str__()
        return '%s, width:%.1f, height:%.1f, resolution:%.1f' % (str, self.width, self.height, self.resolution)

# test

screen = Screen()
screen.height = 768
screen.width = 1024
print(screen)