pandas根据某一列值分组

import pandas as pd
import numpy as np
df=pd.read_csv('dataset.csv')
print(df.columns)
# print(df.head(5))
group_obj = df.groupby('player_id')
# 遍历分组对象
for i in group_obj:
    # print(i[0])
    print(i[1].values)
    break