小编Chr*_*s B的帖子

I've got a date-ordered dataframe that can be grouped. What I am attempting to do is groupby a variable (Person), determine the maximum (weight) for each group (person), and then drop all rows that come after (date) the maximum.

Here's an example of the data:

df = pd.DataFrame({'Person': 1,1,1,1,1,2,2,2,2,2],'Date': '1/1/2015','2/1/2015','3/1/2015','4/1/2015','5/1/2015','6/1/2011','7/1/2011','8/1/2011','9/1/2011','10/1/2011'], 'MonthNo':[1,2,3,4,5,1,2,3,4,5], 'Weight':[100,110,115,112,108,205,210,211,215,206]})

    Date      MonthNo  Person  Weight
0   1/1/2015        1       1     100
1   2/1/2015        2       1     110
2   3/1/2015        3       1     115
3   4/1/2015        4       1     112
4   5/1/2015        5       1 …