python中修饰符@的使用

# -*- coding: utf-8 -*-

#!/usr/bin/env python

 

def spamrun(fn):

    def sayspam(*args):

        print "spam,spam,spam "

        fn(*args)

        return   

    return sayspam

 

@spamrun

def useful(a,b):

    print a**2+b**2

   

useful(3,4)

 

def myDeco(args):

    print("Hello ,I'm Decorator!")

    print("args:",args) #处理参数 

    def _myDeco(func):#处理函数 

        def __myDeco(*args,**kwargs): #处理函数的参数 

            print ("function name: %s " % (func.__name__) )

            ret = func(*args,**kwargs)

            return ret

        return __myDeco

    return _myDeco

 

@myDeco("my_name")

def run(a,b):

    print("func run start:")

    print("---------------")

    print("run(%s,%s)" % (a,b))

    print("---------------")

    print("func run end")

 

 

run(1,2)

 

class myDecorator(object):

 

    def __init__(self, fn):

        print "inside myDecorator.__init__()" , fn.__name__

        self.fn = fn

 

    def __call__(self,*args):

        self.fn(args)

        print "inside myDecorator.__call__()" ,args[0],args[1],args[2]

 

@myDecorator

def aFunction(a=0,b=0,c=0):

    print "inside aFunction()"

 

print "Finished decorating aFunction()"

 

aFunction(1,2,3)