If you want to do a big project in Python, it's considered best practice nowadays to have a thorough test suite, in part to catch the sorts of goofs that the ty

If you want to do a big project in Python, it's considered best practice nowadays to have a thorough test suite, in part to catch the sorts of goofs that the typechecker would otherwise tell you about (though a good test suite will do a great deal more than that). However, Rails is a Ruby web framework; Python and Rails do not mix. The Python equivalents would be Django or, I think, Pyramid.