我想在我的Pandas数据帧中添加累积和列,以便:
name | day | no
-----|-----------|----
Jack | Monday | 10
Jack | Tuesday | 20
Jack | Tuesday | 10
Jack | Wednesday | 50
Jill | Monday | 40
Jill | Wednesday | 110
变为:
Jack | Monday | 10 | 10
Jack | Tuesday | 30 | 40
Jack | Wednesday | 50 | 90
Jill | Monday | 40 | 40
Jill | Wednesday | 110 | 150
我试过各种连击df.groupby和df.agg(lambda x: cumsum(x))无济于事.提前致谢!