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These tutorials explore the various Python modules available for database administration. Particular emphasis will be laid on MySQL and PostgreSQL database querying.
This page at Linux Journal offers a beginner-friendly introduction to Python's database interface. While not comprehensive by any means, it shows the rudiments of using Python for database work.
If you need to use Oracle and want to use Python and Zope for your application, you may want to use this interface. DCOracle2 functions as an adapter, or plugin, for the standard Python 2.x database interface.