(Article author here.) Yup, there's also the more common approach of implementing extensions in C (or equivalent), possibly with an intermediate language. For

(Article author here.) Yup, there's also the more common approach of implementing extensions in C (or equivalent), possibly with an intermediate language. For example, Cython is a much more scalable approach, in my experience, than attempting to describe the interface in Python and using a libffi-style binding.