property干嘛的

>>> import datetime

>>> class c():

    @property

    def noww(self):

        return datetime.datetime.now()

>>> c.noww

<property object at 0x00000000031DE908>

>>> x=c()

>>> x.noww

datetime.datetime(2014, 1, 27, 13, 17, 14, 725610)

>>> x.noww

datetime.datetime(2014, 1, 27, 13, 17, 27, 8740)

>>> x.noww()

Traceback (most recent call last):

  File "<pyshell#50>", line 1, in <module>

    x.noww()

TypeError: 'datetime.datetime' object is not callable

看来应该是免得每次都要敲对括号