python - 如何判断rss是否更新过

Question

最近在写一个python程序要把一些rss中的文章不断获取下来 但不知道怎么判断rss是否更新过，只获取那些更新出来的文章 目前的想法是对每一个rss存一个最新文章的时间，下一次把所有更新的文章获取下来，然后更新这...

ringa_lee · Answer

Theoretically, RSS should return a last-modified or etag (atom) in the http header, which can be judged by this

In python’s feedparser, you can use it like this

import feedparser
d = feedparser.parse(rss_url)
d = feedparser.parse(rss_url, modified=d.modified, etag=d.etag)
d.status # 304
d.feed # {}

If there is no update, you will not get anything the second time

迷茫 · Answer

Doesn’t RSS have a GUID? Save the latest GUID and make a judgment when crawling again. Whether or not RSS has been updated is the business of other people’s server programs and you can’t control it either

黄舟 · Answer

lz, please give me this program code! The final topic is this. I would like to ask the poster for help. I have zero basic knowledge and how to complete this project quickly. Crab