向列表中多个数据框中的选定列名添加列值前缀

import pandas as pd

def add_prefix_to_columns(dataframes, column_names, prefix):
    for df in dataframes:
        for col_name in column_names:
            if col_name in df.columns:
                df[col_name] = prefix + df[col_name].astype(str)

# 创建示例数据框
df1 = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
df2 = pd.DataFrame({'C': [7, 8, 9], 'D': [10, 11, 12]})

# 添加前缀到选定列名
dataframes = [df1, df2]
column_names = ['A', 'C']
prefix = 'prefix_'
add_prefix_to_columns(dataframes, column_names, prefix)

# 打印修改后的数据框
print(df1)
print(df2)