如何编写代码来读取输出文件，以计算出它在抓取网站上走了多远，然后从它停止的地方开始

def calculate_distance(input_file, output_file):
    # 读取输入文件
    with open(input_file, 'r') as file:
        links = file.readlines()

    # 计算走过的距离
    distance = len(links)

    # 读取输出文件，找到停止的地方
    with open(output_file, 'r') as file:
        last_visited_link = None
        for line in file:
            last_visited_link = line.strip()

        # 根据停止的地方找到下一个要访问的链接
        start_index = links.index(last_visited_link) + 1
        next_link = links[start_index]

    # 输出结果
    print("走过的距离：", distance)
    print("下一个要访问的链接：", next_link)

# 使用示例
input_file = "input.txt"
output_file = "output.txt"
calculate_distance(input_file, output_file)