You might have to log in to your Google account to view this page:
Google Cloud print for Programmers
Even better:
Python Code Samples
However, there is a warning at the top of the page:
The code samples below have not been updated since 2011 and are in the process of being rewritten to work properly with the latest specification of the Google Cloud Print API. In the meantime, please use the content on this page solely as a rough reference and do not base the implementation of your application on it.
I was hoping somebody here was using the system and could comment on its status. Or provide updated examples...