Python: Merg RSS Feeds

from datetime import datetime

tstart = datetime.now()
# Set the feed/channel level properties
# ----------------------------------- #
chanTitle = 'Feed Merger'
chanLink = 'http://server.com/feed'
chanAuthor = 'Bob Dylan'
chanDescription = 'Brain Food'
# ----------------------------------- #
# Apply feed/channel level properties
# ----------------------------------- #
feed = Feed()
feed.feed["title"] = chanTitle
feed.feed["link"] = chanLink
feed.feed["author"] = chanAuthor
feed.feed["description"] = chanDescription
# ----------------------------------- #
urls = list(set(open('urls.txt', 'r').readlines()))
shuffle(urls)
extract_entries = lambda url: feedparser.parse(url).entries
addEntries = lambda entries: [feed.items.append(entry) for entry in entries]
merg = lambda urls: [addEntries(extract_entries(url)) for url in urls]
shuffle(feed.entries)
save = lambda outfile: feed.format_rss2_file(outfile)
merg(urls)
save('feed.xml')
tend = datetime.now()
runtime = tend - tstart
print "Runtime > %s" % (runtime)
print "Merged  > %d items" % (len(feed.entries))