将文本文件中包含的字符串添加到每第4行的末尾

def add_string_to_4th_line(file_path, string_to_add):
    # 打开文本文件并读取内容
    with open(file_path, 'r') as file:
        lines = file.readlines()
    
    # 遍历行列表，找到每第4行的位置，并在行末尾添加字符串
    for i in range(3, len(lines), 4):
        lines[i] = lines[i].rstrip('\n') + string_to_add + '\n'
    
    # 将修改后的内容写回文件
    with open(file_path, 'w') as file:
        file.writelines(lines)

file_path = "path/to/your/file.txt"  # 替换为你的文件路径
string_to_add = "Your string here"  # 替换为你要添加的字符串

add_string_to_4th_line(file_path, string_to_add)