pandas 如何将分组的 value 传入 apply 函数中 - V2EX
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ErenJaeger
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pandas 如何将分组的 value 传入 apply 函数中

  •  
  •   ErenJaeger 2021-05-21 15:00:31 +08:00 1946 次点击
    这是一个创建于 1605 天前的主题,其中的信息可能已经有所发展或是发生改变。

    举个例子

    In [4]: df Out[4]: name age cup 0 hah 18 A 1 wuwu 19 B 2 bibi 20 C 3 diid 21 D def hh(df, cup_value): ... return 

    我想按 cup,分组如何将 cup 的值传入 apply 函数中?除去在 apply 函数中根据 df 获取

    4 条回复    2021-05-24 08:59:22 +08:00
    Rush9999
        1
    Rush9999  
       2021-05-21 17:22:11 +08:00   1
    for cup,temp_df in df.groupby(['cup']) :
    temp_df.apply(hh,args=(cup))
    ErenJaeger
        2
    ErenJaeger  
    OP
       2021-05-21 17:55:07 +08:00
    @Rush9999 感谢,受教了
    yech1990
        3
    yech1990  
       2021-05-22 10:50:12 +08:00 via Android
    x.name 就是 group key,不要写循环。
    df.groupby("cup").apply(lambda x: hh(x, x.name))
    ErenJaeger
        4
    ErenJaeger  
    OP
       2021-05-24 08:59:22 +08:00
    @yech1990 谢谢老哥,查文档还没查到这一说
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