Hey @tabuariki! You can specify the version number, like @vercel/python@4.3.0 from one of those available in the npm package at https://www.npmjs.com/package/@vercel/python?activeTab=versions
However, any *.py files in the /api directory should automatically use the Python Runtime. Meaning you could remove that builds section entirely.
A database is a trickier thing since you wouldn’t be able to write to the files after they were deployed. An external database, or one of the Vercel Storage options, is typically the preferred solution for data storage.