如何按多列分组以在pandas数据帧中列出

import pandas as pd

# 创建数据帧
data = {'Name': ['John', 'Mike', 'Sarah', 'John', 'Mike'],
        'City': ['New York', 'Paris', 'London', 'New York', 'Paris'],
        'Age': [25, 30, 28, 25, 30],
        'Salary': [5000, 6000, 5500, 5000, 6000]}
df = pd.DataFrame(data)

# 按多列分组
grouped = df.groupby(['Name', 'City'])

# 列出分组后的结果
for name, group in grouped:
    print(name)
    print(group)

('John', 'New York')
  Name      City  Age  Salary
0  John  New York   25    5000
3  John  New York   25    5000
('Mike', 'Paris')
  Name   City  Age  Salary
1  Mike  Paris   30    6000
4  Mike  Paris   30    6000
('Sarah', 'London')
   Name    City  Age  Salary
2  Sarah  London   28    5500