class Screen(object):
    def __init__(self):
        self.__width=1280
        self.__height=768
        self.__resolution=1280*768

    @property
    def resolution(self):
        return self.__resolution

    @property
    def width(self):
        return self.__width
    @width.setter
    def width(self,value):
        self.__width=value

    @property
    def height(self):
        return self.__height
    @height.setter
    def height(self,value):
        self.__height=value