How can I download all posts from a feed such as http://feeds2.feedburner.com/meinscheissleben with Python?
Try feedparser and read the docs.
import feedparser
>>> url = 'http://feeds2.feedburner.com/meinscheissleben '
>>> d = feedparser.parse(url)
len(d['entries']) # nr of entries
d['entries'][0] # pick one