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Raharasomaha
Asked:2020-09-21 15:35:06 +0000 UTC2020-09-21 15:35:06 +0000 UTC

我不明白为什么条件不起作用？

  • 772

我使用 feedparser 库解析该资源的 RSS 提要，然后将结果写入数据库。我收到此错误：

Traceback (most recent call last):
  File "C:\Users\AppData\Local\Programs\Python\Python37-32\lib\site-packages\feedparser.py", line 398, in __getattr__
    return self.__getitem__(key)
  File "C:\Users\AppData\Local\Programs\Python\Python37-32\lib\site-packages\feedparser.py", line 356, in __getitem__
    return dict.__getitem__(self, key)
KeyError: 'published'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:/Users=PycharmProjects/parser_russian_resource/parser_rss.py", line 61, in <module>
    call_all_func(resources)
  File "C:/UsersPycharmProjects/parser_russian_resource/parser_rss.py", line 40, in call_all_func
    rss_published = feed.published
  File "C:\Users\Администратор\AppData\Local\Programs\Python\Python37-32\lib\site-packages\feedparser.py", line 400, in __getattr__
    raise AttributeError("object has no attribute '%s'" % key)
AttributeError: object has no attribute 'published'

我明白这个错误是什么意思。这意味着我使用了错误的密钥。结果，代码崩溃了。为了一切顺利，我决定提出一个条件。

也就是说，如果发布的密钥不匹配，则使用更新的密钥，如果更新的密钥不匹配，则使用 pubdate 密钥。为此，我编写了以下代码：

rss_published = feed.published

            if rss_published != feed.published:
                rss_published = feed.updated
            else:
                rss_published = feed.pubdate

在这里我无法理解。为什么条件不起作用？

python

1 个回答

  1. Best Answer

    正如上面评论中提示的那样。我决定进行异常检查

                    try:
                    rss_published = feed.updated
                except (KeyError,AttributeError):
                    rss_published = feed.pubdate
                    rss_published = feed.published
    • 0

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