如何在groupby中获取重复的主键？

Question

每当我使用groupby时，我得到的结果如下：

 df.groupby(by =['day','gender']).['total].sum()

输出：

gender day  sum
male   mon   56
       tues  45
       ..
female mon    44
       tues   25
        ...   

我希望输出：

gender day  sum
male   mon   56
male   tues  45
       ..
female mon    44
female tues   25

Answer 1

try:

df.groupby(by=['day', 'gender'], as_index=False).['total'].sum()