这种不定参数的函数,什么时候会用到啊? - V2EX
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wsds

这种不定参数的函数,什么时候会用到啊?

  •  
  •   wsds May 7, 2018 2913 views
    This topic created in 2935 days ago, the information mentioned may be changed or developed.

    我怎么感觉我用不到啊?

    def test(*args,**kwargs): return args,kwargs 
    7 replies    2018-05-25 13:48:50 +08:00
    flynaj
        1
    flynaj  
       May 7, 2018 via Android
    printf
    heeroz
        2
    heeroz  
       May 8, 2018
    这是因为 python 不定参要打的字太多了,所以没人用
    GeruzoniAnsasu
        3
    GeruzoniAnsasu  
       May 8, 2018
    @
    afpro
        4
    afpro  
       May 8, 2018
    decorator
    lifeishort
        5
    lifeishort  
       May 8, 2018 via iPhone
    比如你做个外卖点单,把客人的单打印在纸上。
    客人要点,米饭,番茄炒蛋,酸菜鱼,麻婆豆腐微辣,炒粉丝变态辣。
    你就可以愉快的写不定参数和关键字参数了。
    814084764
        6
    814084764  
       May 8, 2018
    就是你不知道有几个参数的时候用到。比如楼上说的关键字参数。
    cjq8z
        7
    cjq8z  
       May 25, 2018 via Android
    *args,中的*让 Python 创建一个名为 args 的空元组,比如做一道菜需要的配料,不同客人有不同的要求,所以先创建一个空的元组,具体所用到的配料才写入。
    **kwargs,用来接收任意数量的实参,比如个人信息,并不清楚用户会输入什么信息,所以写一个名为 kwargs 的能接受任意数量的关键字实参。
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