如何从文件夹中的文件中删除行？

import os

def delete_lines_from_files(folder_path, file_extension, target_line):
    for filename in os.listdir(folder_path):
        if filename.endswith(file_extension):
            file_path = os.path.join(folder_path, filename)
            with open(file_path, 'r+') as file:
                lines = file.readlines()
                file.seek(0)
                for line in lines:
                    if target_line not in line:
                        file.write(line)
                file.truncate()

# 示例用法
folder_path = '/path/to/folder'
file_extension = '.txt'
target_line = 'delete this line'

delete_lines_from_files(folder_path, file_extension, target_line)