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| #pragma section-numbers off = Python RSS Code = Articles: * [http://www-106.ibm.com/developerworks/webservices/library/ws-pyth11.html The PythonWeb services developer: RSS for Python] Libraries: * [http://www.mnot.net/python/RSS.py RSS.py] - reads most RSS versions, produces RSS 1.0 * [http://diveintomark.org/projects/feed_parser/ Feed Parser] - reads 9 RSS versions == Feed Parser == [http://diveintomark.org/projects/feed_parser/ Feed Parser] is an awesome RSS reader. Download it, and then start a Python prompt in the same directory. {{{ #!python import feedparser python_wiki_rss_url = "http://www.python.org/cgi-bin/moinmoin/" \ "RecentChanges?action=macro&" \ "macro=RecentChanges&do=rss_rc" feed = feedparser.parse( python_wiki_rss_url ) }}} You now have the RSS feed data for the Python``Info wiki! Take a look at it; There's a lot of data there. Of particular interest: || {{{feed[ "bozo" ]}}} || {{{1}}} if the feed data can't be read. || || {{{feed[ "url" ]}}} || URL of the feed's RSS feed || || {{{feed[ "version" ]}}} || version of the RSS feed || || {{{feed[ "channel" ][ "title" ] }}} || {{{"PythonInfo Wiki"}}} - Title of the Feed. || || {{{feed[ "channel" ][ "description" ]}}} || {{{"RecentChanges at PythonInfo Wiki."}}} - Description of the Feed || || {{{feed[ "channel" ][ "link" ]}}} || Link to RecentChanges - Web page associated with the feed. || || {{{feed[ "channel" ][ "wiki_interwiki" ]}}} || {{{"Python``Info"}}} - For wiki, the wiki's preferred InterWiki moniker. || || {{{feed[ "items" ]}}} || A gigantic list of all of the Recent``Changes items. || For each item in {{{feed["items"]}}}, we have: || {{{item[ "date" ]}}} || {{{"2004-02-13T22:28:23+08:00"}}} - ISO 8601 (right#?) date || || {{{item[ "date_parsed" ]}}} || {{{(2004,02,13,14,28,23,4,44,0)}}} || || {{{item[ "title" ]}}} || title for item || || {{{item[ "summary" ]}}} || change summary || || {{{item[ "link" ]}}} || URL to the page || || {{{item[ "wiki_diff" ]}}} || for wiki, a link to the diff for the page || || {{{item[ "wiki_history" ]}}} || for wiki, a link to the page history || == Aggregating Feeds with Feed Parser == If you're pulling down a lot of feeds, and aggregating them: First, you probably want to use [http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/84317 Future threads] to pull down your feeds. That way, you can send out 5 requests immediately, and wait for them all to come back at once, rather than sending out a request, waiting for it to come in, send out another request, wait for it to come back in, etc., etc.,. {{{ #!python from future import Future hit_list = [ "http://...", "...", "..." ] # list of feeds to pull down # pull down all feeds future_calls = [Future(feedparser.parse,rss_url) for rss_url in hit_list] # block until they are all in feeds = [future_obj() for future_obj in future_calls] }}} Now that you have your feeds, extract all the entries. {{{ #!python entries = [] for feed in filter( lambda x:x["bozo"]==0, feeds ): entries.extend( feed[ "items" ] ) }}} ...and sort them, by SortingListsOfDictionaries: {{{ #!python decorated = [(entry["date_parsed"], entry) for entry in entries] decorated.sort() decorated.reverse() # for most recent entries first sorted = [entry for (date,entry) in decorated] }}} Congradulations! You've aggregated a bunch of changes! == Contributors == LionKimbro == Discussion == (none yet) |
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