From the README:

  PyGreSQL is a python module that interfaces to a PostgreSQL database. It
  embeds the PostgreSQL query library to allow easy use of the powerful
  PostgreSQL features from a Python script.

As of version 3.2, PyGreSQL was folded into the PostgreSQL development tree.
PyGreSQL includes a DB-API 2.0 compliant API wrapper.

Author:   D'Arcy J.M. Cain <darcy@druid.net>
WWW:      http://www.druid.net/pygresql/
See also: http://www.postgresql.org/idocs/index.php?pygresql.html