python装饰器 示例2

下面的程序示例了python装饰器的使用：

#!/usr/bin/env python
#coding:utf-8
def Filter(before_func,after_func):
print before_func
print after_func
def outer(main_func):
print main_func
def wrapper(request,kargs):
before_result=before_func(request,kargs)
if(before_result!=None):
return before_result;

main_result=main_func(request,kargs)
if(main_result!=None):
return main_result;

after_result=after_func(request,kargs)
if(after_result!=None):
return after_result;
return wrapper
return outer

def before(request,kargs):
print request,kargs,'之前！'

def after(request,kargs):
print request,kargs,'之后！'

@Filter(before,after)
def main(request,kargs):
print request,kargs

main('hello','python')
print main

运行结果:

<function before at 0x02AC7BF0>

<function after at 0x02AC7C30>

<function main at 0x02AC7CF0>

hello python 之前！

hello python

hello python 之后！

<function wrapper at 0x02AC7D30>

我们可以加上很多断点，在Debug模式下运行，查看程序一步一步的运行轨迹。。。