如何在python中批量替换多个文件中的行？

import os

def batch_replace_lines(folder, target_line, replacement):
    # 获取目标文件夹下的所有文件名
    filenames = os.listdir(folder)
    
    # 遍历每个文件名
    for filename in filenames:
        # 判断文件是否为文本文件
        if os.path.isfile(os.path.join(folder, filename)) and os.path.splitext(filename)[1] == '.txt':
            # 打开文件并逐行读取内容
            with open(os.path.join(folder, filename), 'r') as file:
                lines = file.readlines()
            
            # 在每一行中查找目标行并进行替换
            replaced_lines = [line.replace(target_line, replacement) for line in lines]
            
            # 将替换后的内容写回原文件
            with open(os.path.join(folder, filename), 'w') as file:
                file.writelines(replaced_lines)

# 示例用法
batch_replace_lines('folder_path', 'target_line', 'replacement')