The rpclib.php files are for Moodle Networks, which is based on XML-RPC, but is incompatible since it adds some security layers on top. There is no other web services implementation that comes with Moodle 1.9. Moodle 2.0 will come with various web services (XML-RPC, SOAP, REST, etc.).
If you want to use Moodle 1.9, you will either need to implement Moodle Networks in Python (which will probably be quite hard, as the protocol is not completely documented yet), or use the web services plugin from Moodle contrib (http://cvs.moodle.org/contrib/patches/ws/), which will provide a SOAP interface.