包装器举例 1

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    import functools

    def spamrun(fun):        #@functools.wraps(fun)        def sayspam(*args,**kwargs):            print '2 => target1:%s,%s,%s'%(fun.__name__,args,kwargs)            ret =  fun(*args)            print '4 =>'            return ret        return sayspam        def spamrun2(fun):        #@functools.wraps(fun)        def sayspam(*args,**kwargs):            print '1 =>  target2:%s,%s,%s'%(fun.__name__,args,kwargs)            ret = fun(*args)            print '5 =>  '            return ret        return sayspam        def simple(fun):        print u'执行simple 简单装饰' + fun.__name__        return fun            #@pack    #@simple    @spamrun2    @spamrun    def useful(*args,**kwargs):        print u'3 =>执行useful函数',args

    #上面的包装器等同于下面的调用，结果一致    #useful = spamrun2(spamrun(useful))    useful(1,2,3)

输出

1 =>  target2:sayspam,(1, 2, 3),{}2 => target1:useful,(1, 2, 3),{}3 =>执行useful函数 (1, 2, 3)4 =>5 =>

</pre><pre code_snippet_id="599387" snippet_file_name="blog_20150206_3_7287509" name="code" class="python">

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