python装饰器

 

#装饰函数和方法

def foo():

    print 'foo'

  

def foo():

    print 'before do something'

    print 'foo'

    print 'after'

 

def foo():

    print 'foo'

     

def wrapper(func):

    print 'before'

    func()

    print 'after'

      

wrapper(foo)

 

def foo():

    print 'foo'

     

def wrapper(func):

    def result():

        print 'before'

        func()

        print 'after'

    return result

Do = wrapper(foo)

Do()

     

def wrapper(func):

    def result():

        print 'before'

        func()

        print 'after'

    return result

 

@wrapper

def foo():

    print 'foo'

 

foo()

 

#带参数的装饰器

#在函数执行前后，执行任意函数

#!/usr/bin/env python

#coding:utf-8

 

def Before(request,kargs):

    print 'before'

     

def After(request,kargs):

    print 'after'

 

def Filter(before_func,after_func):

    def outer(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

     

@Filter(Before, After)

def Index(request,kargs):

    print 'index'

          

if __name__ == '__main__':

    Index(1,2)

 

def outer(fun):
　　def wrapper(arg):
　　　　print '验证'
　　　　result = fun(arg)
　　　　print 'ok'
　　　　return result
　　return wrapper

@outer
def Func1(arg):
　　print 'func1',arg
　　return 'return'
#@outer = outer(Func1)

response = Func1('li')
print response

#装饰类