This document describes the execution trace format that serves as the

interface between the frontend and backend of Online Python Tutor

(thereafter abbreviated as OPT).

It is a starting point for anyone who wants to create a different

backend (e.g., for another programming language) or a different frontend

(e.g., for visually-impaired students). View it online at:

Look at the Git history to see when this document was last updated; the

more time elapsed since that date, the more likely things are

out-of-date.

I'm assuming that you're competent in Python, JSON, command-line-fu, and

Google-fu. Feel free to email philip@pgbovine.net if you have questions.

And please excuse the sloppy writing; I'm not trying to win any style awards here :)

(TODO: write me sometime!)