This may or may not help...

Whenever I have issues with db drivers, I clear out my environment and 
start from scratch (before that, I'll remove all the .pyc files too).

1. Sometimes there's a weird import going on and the wrong versions are 
loading (due to packaging issues. this happened a lot with mysql to me).
2. If you upgraded python (lets say from 2.7.1 to 2.7.2) and there were 
c-compiled extensions, they often break.

There's a good chance none of that is happening -- but because this is a db 
driver issue and you've been trying multiple driver versions... that's just 
a warning sign to me for weird import errors possibly going on.

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