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= 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
 * SpycyRoll - I don't know much about - this is an ''aggregator,'' and perhaps other stuff as well

== 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 isn't well-formed XML. ||
|| {{{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 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 ==

Getting the "author"/"contributor" our of ModWiki with the feedparser module is a bit confusing as of now. Right now (feedparser 3.3), it goes into the "rdf_value" attribute of the entry.
 My hobby is mainly Running. <<BR>>
I also try to learn Korean in my spare time.<<BR>>
<<BR>>
Feel free to visit my webpage: [[http://username17331.postbit.com/miranda-lambert-denies-rumors-of-weight-loss-surgery.html|2 week liquid diet]]

My hobby is mainly Running.
I also try to learn Korean in my spare time.

Feel free to visit my webpage: 2 week liquid diet

RssLibraries (last edited 2014-05-08 00:46:56 by DaleAthanasias)

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