本文实例讲述了Python装饰器用法。分享给大家供大家参考,具体如下:
下面的程序示例了python装饰器的使用:
示例一:
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def outer(fun): print fun def wrapper(arg): result = fun(arg) print 'over!' return result return wrapper @outer def func1(arg): print 'func1' ,arg return 'very good!' response = func1( 'python' ) print response print func1 |
运行结果:
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<function func1 at 0x02A67D70 > func1 python over! very good! <function wrapper at 0x02A67CF0 > |
示例二:
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#!/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:
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<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。。。
希望本文所述对大家Python程序设计有所帮助。
原文链接:http://blog.csdn.net/sxingming/article/details/52386117