Good point, and shows that I haven't kept up with the latest developments here :-) Though in the context of a one-off research project, I still think picking a

Good point, and shows that I haven't kept up with the latest developments here :-) Though in the context of a one-off research project, I still think picking a concrete Python version and using its byte/wordcode is the better choice. It won't be an enterprise-quality project with a long lifetime, but neither is the author's solution of parsing (a subset of) Python manually.