如何获取groupby返回的序列的索引标签？

import pandas as pd

# 创建一个DataFrame
data = {'Name': ['Tom', 'Nick', 'John', 'Tom', 'John'],
        'Age': [28, 31, 25, 28, 25],
        'City': ['London', 'New York', 'Paris', 'London', 'Paris']}
df = pd.DataFrame(data)

# 按照Name进行分组
grouped = df.groupby('Name')

# 获取groupby返回的序列的索引标签
for name, group_indices in grouped.groups.items():
    print("Name:", name)
    print("Group Indices:", group_indices)
    print()

Name: John
Group Indices: Int64Index([2, 4], dtype='int64')

Name: Nick
Group Indices: Int64Index([1], dtype='int64')

Name: Tom
Group Indices: Int64Index([0, 3], dtype='int64')