GeoTypes is a Python library that implements both the OpenGIS/PostGIS
and standard PostgreSQL geometry types. It integrates with the psycopg
Python/PostgreSQL interface. It provides implementations of all of the
OpenGIS/PostGIS classes, except (x,y,m) and (x,y,z,m). It currently
supports the EWKB, HEXEWKB, WKB, and WKT formats.

WWW: http://freecode.com/projects/geotypes