Pickle(Python 3.6)写入空文件

问题不在于pickle模块,而在于这行代码:

 all_posts = previous_posts.extend(current_posts)

实际上发生的是 延伸 方法,扩展之前的_帖子,一旦成功完成就会返回关键字 没有一个 .

然后将该关键字分配给所有_帖子,而不是之前的_帖子的内容,然后将其写入文件。

尝试按如下方式修改它:

if new_post_count > 0:
    file_name = 'all_posts' + user

    previous_posts = pickle.load(open(file_name, 'rb'))

    current_posts = get_posts(client, user, start_from_posts=0, total_posts=new_post_count)

    previous_posts.extend(current_posts)

    f = open(file_name, 'wb')
    pickle.dump(previous_posts, f)
    f.close() 

最好包括让·弗朗索瓦的建议:

if new_post_count > 0:
    file_name = 'all_posts' + user
    with open(file_name, 'rb') as f:
        previous_posts = pickle.load(f)

    current_posts = get_posts(client, user, start_from_posts=0, total_posts=new_post_count)

    previous_posts.extend(current_posts)

    with open(file_name, 'wb') as f:
        pickle.dump(previous_posts, f)