Get a bit.ly short URL

gistfile1.py

import urllib
import simplejson

def getBitlyURL(login, api_key, url):
    params = urllib.urlencode({'login': login, \
                               'apiKey': api_key, \
                               'version': '2.0.1', \
                               'format':  'json',
                               'longUrl': url})
    uri = urllib.urlopen('http://api.bit.ly/shorten?%s' % params)
    json_data = uri.read()
    data = json.loads(json_data)
    if data['errorCode'] == 0 and len(data['results'][url]):
        return data['results'][url]['shortUrl']
    else:
        return None