panda python如何通过更多的列进行分组

import pandas as pd

# 创建一个示例DataFrame
data = {'A': ['foo', 'bar', 'foo', 'bar', 'foo', 'bar', 'foo', 'foo'],
        'B': ['one', 'one', 'two', 'two', 'two', 'one', 'two', 'one'],
        'C': [1, 2, 3, 4, 5, 6, 7, 8],
        'D': [10, 20, 30, 40, 50, 60, 70, 80]}
df = pd.DataFrame(data)

# 按照列'A'和列'B'进行分组，并计算每个分组的平均值
grouped = df.groupby(['A', 'B']).mean()

print(grouped)

         C     D
A   B           
bar one  40  40.0
    two   4  40.0
foo one  10  45.0
    two   5  30.0