I am the author. Plain .q is supposed to be language agnostic (and I'd say it's relatively featureful), whereas .py.q, .js.q, etc. would be used if you wanted t

I am the author. Plain .q is supposed to be language agnostic (and I'd say it's relatively featureful), whereas .py.q, .js.q, etc. would be used if you wanted to embed some other language (though there's only a Python implementation for the time being). That's the logic behind the naming scheme, anyway :)