话说 Python 官网里面有详细讲装饰器( decorator)吗? - V2EX
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话说 Python 官网里面有详细讲装饰器( decorator)吗?

  •  
  •   HxSeek 2015-01-02 23:33:06 +08:00 3713 次点击
    这是一个创建于 3945 天前的主题,其中的信息可能已经有所发展或是发生改变。
    如题,我在官方文档内(2.X)版本那 查找不到请问是没有?还是我找不到而已。 如果官方文档没有大家是看什么入门decorator的?
    8 条回复    2015-01-03 21:01:17 +08:00
    xiandao7997
        1
    xiandao7997  
       2015-01-02 23:46:13 +08:00 via Android
    不懂 decorator, 不过 lz 的问题可以搜索 decorator site:python.org :)
    另,找到一个教程, http://www.cnblogs.com/vamei/archive/2012/09/13/2682778.html
    binux
        2
    binux  
       2015-01-02 23:54:25 +08:00
    https://docs.python.org/2/reference/compound_stmts.html#function-definitions
    你还要多详细,本来就没多少东西,就一语法糖
    yourmoonlight
        3
    yourmoonlight  
       2015-01-03 09:07:00 +08:00
    @f1(arg)
    @f2
    def func(): pass
    is equivalent to:

    def func(): pass
    func = f1(arg)(f2(func))
    zonyitoo
        4
    zonyitoo  
       2015-01-03 11:13:57 +08:00
    decorator就是一个语法糖来的而已呀
    yourmoonlight
        5
    yourmoonlight  
       2015-01-03 13:41:17 +08:00
    python decorators are equated to macros.

    the goal of macros is to provide a way to modify elements of the language.

    that's what decorators do in python, they modify functions, in the case of class decorators, entire classes.
    rcmerci
        6
    rcmerci  
       2015-01-03 14:03:53 +08:00   1
    的确只是语法糖而已,nothing more
    HxSeek
        7
    HxSeek  
    OP
       2015-01-03 15:35:25 +08:00
    原来如此小白就此谢过大家的回复啦
    clvrobj
        8
    clvrobj  
       2015-01-03 21:01:17 +08:00
    虽然lz已经原来如此了,还是留下个觉得有用的链接 https://www.python.org/dev/peps/pep-0318/
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