I've released my Python-PostgreSQL DB-API adapter "ocpgdb" on Google Code:
This adapter module differs from the other Py/PG adapters in that it
uses the binary PG protocol 3, which tends to make it somewhat faster
and (maybe) a little safer. Determining the specifics of the serialised
binary types took quite a bit of work - this might make the code of
interest to others attempting to use the binary protocol.
The adapter aims to code as little as possible in C, with the C code
forming a fairly thin wrapper around libpq. Serialisation is implemented
at the Python level (often with the help of the "struct" module) -
the result is surprisingly quick.
We have been using the module as it stands in several production
systems for about a year without problems. That said, there is little
documentation (things should mostly work according to PEP-249), and the
module does not implement some features commonly provided by other modules
(in particular, a "row dict", nor threading support).
Andrew McNamara, Senior Developer, Object Craft
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