Rapid web app development tool for database

[George Sakkis]

Is there any tool in python (or with python bindings) like Oracle
Application Express, former HTML DB
(http://www.oracle.com/technology/products/database/application_express/index.html)
? Ideally it should be dbms-agnostic, e.g. by using SQLObject to talk
to the database. The closest I can think of is Dabo, but it (currently)
supports wxPython only for the UI. If there isn't anything like this
out of the box, what would the best starting point be for implementing
such a system ? Extending Dabo, a web framework (e.g. Django), or
something different ? 

George