python-高级编程-03

#coding:utf8
def mydecorator(function):
    def _mydecorator(*args,**kw):

        #在调用实际函数之前的准备工作
        print ‘start‘
        res = function(*args,**kw)
        #做完某项填充工作
        print ‘end‘
        return res
    return _mydecorator

@mydecorator
def demo():
    print ‘This is test‘

demo()

start
This is test
end