Flickr supports linking to a photo page using a short url such as
http://flic.kr/p/6BTTT6. The flickrapi.shorturl module contains
functionality for working with those short URLs.
flickrapi.shorturl.encode(photoID):
Returns the short ID for this photo ID
flickrapi.shorturl.encode(shortID):
Returns the photo ID for this short ID
flickrapi.shorturl.url(photoID):
Returns the short URL for the given photo ID.
The photo ID, the short ID and the short URL are all unicode strings.