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@property 装饰器可以将类函数包装成实例的属性，通过访问实例属性来操作函数。

class Test(object):
def init(self):
self._voltage = 110

def get_x(self):
    """Get the current voltage."""
    return self._voltage

def set_x(self, value):
    self._voltage = value

def del_x(self):
    del self._voltage

x = property(get_x,set_x,del_x)

或者：
class Test(object):
def init(self):
self._voltage = 110

@property
def x(self):
    """Get the current voltage."""
    return self._voltage

@x.setter
def x(self, value):
    self._voltage = value

@x.deleter
def x(self):
    del self._voltage

t = Test()
print t.x # 110
t.x = 220
print t.x # 220
del t.x
print t.x # 报错