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983天前# -*- coding: utf-8 -*- |
'''请利用@property给一个Screen对象加上width和height属性， |
以及一个只读属性resolution''' |
class Screen(object): |
__slots__ = ('_width','_height') |
@property |
def width(self): |
return self._width |
@property |
def height(self): |
return self._height |
@property |
def resolution(self): |
if not self._width: |
raise ValueError('width is wrong!') |
if not self._height: |
raise ValueError('height is wrong!') |
else: |
return self._width*self._height |
@width.setter |
def width(self,value): |
self._width = value |
@height.setter |
def height(self,value): |
self._height = value |
|
wh = Screen() |
wh.width=10 |
wh.height=20 |
#wh.kuan=20 'Screen' object has no attribute 'kuan' |
print('wh.width(10)',wh.width) |
print('wh.height(20)',wh.height) |
print('wh.resolution',wh.resolution) |
s = Screen() |
s.width = 1024 |
s.height = 768 |
print('resolution =', s.resolution) |
if s.resolution == 786432: |
print('测试通过!') |
else: |
print('测试失败!') |
