如何改变一个方法里的常量 - V2EX
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u2gign

如何改变一个方法里的常量

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  •   u2gign Jul 11, 2022 3507 views
    This topic created in 1402 days ago, the information mentioned may be changed or developed.

    一个 config 里的常量,想在执行另一个方法时能改变这个常量,是否可以

    10 replies    2022-07-20 09:55:16 +08:00
    kop1989smurf
        1
    kop1989smurf  
       Jul 11, 2022
    可以,把这个常量改成变量。
    ethusdt
        2
    ethusdt  
       Jul 11, 2022
    都是常量了, 为什么还要改. 直接赋值给一个变量, 改这个变量吧, 以后用这个变量.
    imn1
        3
    imn1  
       Jul 11, 2022
    python 几乎没有常量概念,都可以改变

    但注意的是,直接改也很可能不是"临时"的
    想暂时改变的话,最好还是 deepcopy 或者继承到新变量再使用
    darkengine
        4
    darkengine  
       Jul 11, 2022
    当一个常量能被改变时,它还是不是常量?
    muchenlou
        5
    muchenlou  
       Jul 11, 2022
    llsquaer
        6
    llsquaer  
       Jul 11, 2022   1
    这问题我遇到过..楼主是想说 config 里面一个 user=111 的值..
    a.py 修改为 user=222
    但是在 b.py 里 依然是 user=111

    我的解决变法是 把他改为 字典 user={'k':111}
    这样 2 边都是变化后的值了.
    wuwukai007
        7
    wuwukai007  
       Jul 11, 2022
    import config
    config.name = 2
    ojbk
    hoopan
        8
    hoopan  
       Jul 12, 2022
    还是定义个变量吧
    u2gign
        9
    u2gign  
    OP
       Jul 14, 2022
    @llsquaer 谢谢,是这个意思哈
    wersonliu9527
        10
    wersonliu9527  
       Jul 20, 2022
    或许这个 partial 有用
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