python @property用法作用
#_*_ coding: utf-8 _*_class Screen(object):
@property
def width(self):
return self._width
@width.setter
def width(self,value):
if not isinstance(value,int):
raise ValueError(' value is wrong type,it need int')
if value < 0:
raiseValueError('value must > 0')
self._width = value
@property
def height(self):
return self._height
@height.setter
def height(self,value):
if not isinstance(value,int):
raise ValueError(' value is wrong type,it need int')
if value < 0:
raiseValueError('value must > 0')
self._height = value
@property
def resolution(self):
self._resolution = self._height * self._width
return self._resolution
s= Screen()
s.width = 1024
print(s.width)
s.height = 768
print(s.height)
print(s.resolution)
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