python Property

property ( [ fget [, fset [, fdel [, doc ] ] ] ] )

class C(object):
    def __init__(self):
        self._x = None

    def getx(self):
        return self._x
    def setx(self, value):
        self._x = value
    def delx(self):
        del self._x
    x = property(getx, setx, delx, doc="I'm the 'x' property.")

If then c is an instance of C, c.x will invoke the getter, c.x = value will invoke the setter and del c.x the deleter.

If given, doc will be the docstring of the property attribute.

 

其实这样看来 property 就是，赋值和读取这2个函数以及删除 集合在一个object里，在实际的代码中，不用显示的写这几个函数，而是通过语句含义隐示的调用这几个函数。

http://docs.python.org/2/library/functions.html