如何删除用户指定的txt列表中的行？

def delete_lines_in_txt(txt_file, lines_to_delete):
    # 读取txt文件
    with open(txt_file, 'r') as file:
        lines = file.readlines()

    # 删除指定行
    for line_to_delete in lines_to_delete:
        if line_to_delete <= len(lines):
            del lines[line_to_delete - 1]

    # 重新写入txt文件
    with open(txt_file, 'w') as file:
        file.writelines(lines)

# 示例调用
txt_file = 'example.txt'  # 用户指定的txt文件路径
lines_to_delete = [2, 4]  # 用户指定要删除的行数列表
delete_lines_in_txt(txt_file, lines_to_delete)