DB beginner help

[Zeljko Vrba]

1. Is there any HOW-TO documentation about DB API except PEP 249?

2. How are you supposed to write DB-driver independent code when each
   driver has its own, possibly different from any other, paramstyle
   ('qmark', 'numeric', etc..)?

In Perl I always use question marks and have no trouble switching the
application between different databases. How do you guys do it in Python
(of course, without rewriting all queries?)