Note:
- Not every movie has a cover url. (The random ID in your example doesn't.)
- Make sure you're using an up-to-date version of IMDbPy. (IMDb changes, and IMDbPy with it.)
...
import imdb
access = imdb.IMDb()
movie = access.get_movie(1132626)
print "title: %s year: %s" % (movie['title'], movie['year'])
print "Cover url: %s" % movie['cover url']
If for some reason you can't use the above, you can always use something like BeautifulSoup to get the cover url.
from BeautifulSoup import BeautifulSoup
import imdb
access = imdb.IMDb()
movie = access.get_movie(1132626)
page = urllib2.urlopen(access.get_imdbURL(movie))
soup = BeautifulSoup(page)
cover_div = soup.find(attrs={"class" : "photo"})
cover_url = (photo_div.find('img'))['src']
print "Cover url: %s" % cover_url