如何在python pandas df中为所选记录添加前缀

import pandas as pd

# 创建一个示例DataFrame
data = {'Name': ['Alice', 'Bob', 'Charlie'], 'Age': [25, 30, 35]}
df = pd.DataFrame(data)

# 定义前缀
prefix = "Mr. "

# 使用apply方法和lambda函数为所选记录添加前缀
df['Name'] = df['Name'].apply(lambda x: prefix + x)

print(df)

       Name  Age
0  Mr. Alice   25
1    Mr. Bob   30
2  Mr. Charlie  35

df['Name'] = df.apply(lambda row: prefix + row['Name'] if row['Age'] > 30 else row['Name'], axis=1)

       Name  Age
0    Alice   25
1      Bob   30
2  Mr. Charlie  35