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python - 嵌套的 For 循环很快停止（初学者）

问题描述

我在我编写的脚本中使用了几个嵌套的 For 循环来抓取 Reddit 的 API，但在抓取单个帖子后脚本似乎停止了。它一直运行在循环中，但无论出于何种原因都不会重复该过程。有人知道这里发生了什么吗？

for i in subreddit:
    submission = reddit.submission(id=i.id)
    comments = submission.comments
    ts = datetime.utcfromtimestamp(i.created_utc).strftime('%Y-%m-%d %H:%M:%S')
    tree = ('Comment section:')
    for comment in comments:
        body = ('----\nComment:' + comment.body + '\n----')
        tree = tree + body
        if len(comment.replies) > 0:
            for reply in comment.replies:
                bodyrply = ('\nREPLY: \n' + reply.body + '----')
                tree = tree + bodyrply
        else:
            tree = tree
    continue
    filewriter.writerow({'title': i.title,'author': i.author,
                         'original content': i.is_original_content,
                         'selfpost': i.is_self,
                         'time created': ts,
                         'stickied': i.stickied,
                         'locked': i.locked,
                         'NSFW': i.over_18,
                         'selftext': i.selftext,
                         'comment forest': tree,
                         'number of comments': i.num_comments,
                         'score': i.score,
                         'upvote ratio': i.upvote_ratio,
                         'permalink': i.permalink,
                         'url': i.url})

标签： pythonapifor-loop

解决方案

这不是最终的答案，但它可能有助于缩小问题的范围。在代码中添加一些检查以确认初始数据是您所期望的。

print("len sr =", len(subreddit))  # is this a valid list greater than 1 ?
for i in subreddit:
    print("i =", i)  # what object are you dealing with ?
    submission = reddit.submission(id=i.id)
    comments = submission.comments
    ts = datetime.utcfromtimestamp(i.created_utc).strftime('%Y-%m-%d %H:%M:%S')
    tree = ('Comment section:')
    print("len cmts =", len(comments))  # are there any comments ?
    for comment in comments:
        body = ('----\nComment:' + comment.body + '\n----')
        tree = tree + body
        if len(comment.replies) > 0:
            for reply in comment.replies:
                bodyrply = ('\nREPLY: \n' + reply.body + '----')
                tree = tree + bodyrply
        else:
            pass    # tree = tree
    print("i2 =", i)   # make sure the code got this far
    continue

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