根据另一个索引值修改DataFrame索引中的值

import pandas as pd

# 创建一个示例DataFrame
data = {'Name': ['Tom', 'Nick', 'John', 'Sam'],
        'Age': [28, 32, 25, 35],
        'City': ['London', 'New York', 'Paris', 'Tokyo']}
df = pd.DataFrame(data)

# 设置新的索引列
df_new = df.set_index('Name')

# 打印修改后的DataFrame
print(df_new)

      Age      City
Name               
Tom    28    London
Nick   32  New York
John   25     Paris
Sam    35     Tokyo

# 设置多个索引列
df_new = df.set_index(['Name', 'Age'])

# 打印修改后的DataFrame
print(df_new)

              City
Name Age          
Tom  28    London
Nick 32  New York
John 25     Paris
Sam  35     Tokyo

# 修改索引值
df_new = df.rename(index={'Tom': 'Thomas', 'Nick': 'Nicholas'})

# 打印修改后的DataFrame
print(df_new)

          Name  Age      City
Thomas     Tom   28    London
Nicholas  Nick   32  New York
John      John   25     Paris
Sam        Sam   35     Tokyo