Python装饰器用法示例小结

时间:2022-10-02 09:50:18

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