NEEDED: SQL Parser callable from python?

[MikeK]

I'm working on a python interface to a home-grown legacy flat-file database.
I've gotten to the point where I'm considering adding an SQL layer to the API.
Can anyone give me a pointer to an open source SQL parser callable from python?
I will need to use it to translate standard SQL into python code callbacks 
to the functions/methods specific to the legacy DB API.

Thanks.