时间：2021-01-07 11:35:48 | 栏目：Python代码 | 点击：次
直接上例子。
import pandas as pd
df = pd.DataFrame({'class':['a','a','b','b','a','a','b','c','c'],'score':[3,5,6,7,8,9,10,11,14]})
df:
| class | score | |
|---|---|---|
| 0 | a | 3 |
| 1 | a | 5 |
| 2 | b | 6 |
| 3 | b | 7 |
| 4 | a | 8 |
| 5 | a | 9 |
| 6 | b | 10 |
| 7 | c | 11 |
| 8 | c | 14 |
df.sort_values(['class','score'],ascending=[1,0],inplace=True) grouped = df.groupby(['class']).head(2)
grouped:
| class | score | |
|---|---|---|
| 5 | a | 9 |
| 4 | a | 8 |
| 6 | b | 10 |
| 3 | b | 7 |
| 8 | c | 14 |
| 7 | c | 11 |