如何筛选具有多个MultiIndex二级条目的行？

import pandas as pd

# 创建一个具有 MultiIndex 结构的示例数据框
data = {'A': [1, 2, 3, 4],
        'B': [5, 6, 7, 8],
        'C': [9, 10, 11, 12]}
index = pd.MultiIndex.from_arrays([['Group1', 'Group1', 'Group2', 'Group2'],
                                   ['Subgroup1', 'Subgroup2', 'Subgroup1', 'Subgroup2']],
                                  names=['Group', 'Subgroup'])
df = pd.DataFrame(data, index=index)

# 筛选具有多个二级条目的行
selected_rows = df.loc[('Group1', 'Subgroup2')]
print(selected_rows)

A    2
B    6
C    10
Name: (Group1, Subgroup2), dtype: int64