如何在python dataframe中获取默认索引或带数字的索引？

import pandas as pd

data = {'Name': ['Alice', 'Bob', 'Charlie'],
        'Age': [25, 30, 35]}
df = pd.DataFrame(data)

default_index = df.index
print(default_index)

RangeIndex(start=0, stop=3, step=1)

import pandas as pd

data = {'Name': ['Alice', 'Bob', 'Charlie'],
        'Age': [25, 30, 35]}
df = pd.DataFrame(data)

df.set_index('Name', inplace=True)
numeric_index = df.index
print(numeric_index)

Index(['Alice', 'Bob', 'Charlie'], dtype='object', name='Name')