It downloads every single octocat in the octocat RSS feed. Requires feedparser and beautiful soup 4, written in/for Python 2.7 (.4)

octocat-index.py

import feedparser
import urllib
from bs4 import *
from urllib2 import urlopen
def urlexists(url):
	try:
		code = urlopen(url)
		return True
	except:
		return False
def getimgfromsummary(summary):
	bs = BeautifulSoup(summary)
	return bs.img.get('src')

def pngorjpg(fname):
	try:
		code = urlopen("http://octodex.github.com/images/" + fname + ".png")
		return fname + ".png"
	except:
		return fname + ".jpg"

def downloadurl(url,file):
	urllib.urlretrieve(url, file)


url  =	"http://feeds.feedburner.com/Octocats"
feed = feedparser.parse(url)

items = feed["items"]

print "indexing"
for item in items:
	iurl = getimgfromsummary(item["summary"])
	ext = iurl.split('.')[-1:][0]
	name = item["title"]
	fname = name.lower()
	if fname.endswith(" v2"):
		fname = fname.split(" v2")[0]
		fname = fname + "_v2"
	fname = fname.replace(" ","")
	fname = fname + "." + ext
	#fname = pngorjpg(fname)
	#nurl = "http://octodex.github.com/images/" + fname
	downloadurl(iurl, fname)
	print "Indexed " + name
print "Done indexing"