#!/user/bin/env python3

-- coding: utf-8 --

'oop2'

author = 'list' class Screen(object): @property def width(self): return self._width @width.setter def width(self,width): if isinstance(width,int): if width > 0: self._width = width else: raise ValueError('width > 0') else: raise TypeError('width must be int')

@property
def height(self):
    return self._height
@height.setter
def height(self,height):
    if isinstance(height,int):
        if height > 0:
            self._height = height
        else:
            raise ValueError('height > 0')
    else:
        raise TypeError('height must be int')

@property
def resolution(self):
    return self._width * self._height

s = Screen() s.width = 1024 s.height = 768 print(s.resolution) assert s.resolution == 786432, '1024 * 768 = %d ?' % s.resolution