In short, this is VPython in a web browser based on RapydScript (a JavaScript Python-to-JavaScript compiler that makes this possible). GlowScript is the platform that I recommend for students.

Introduction to Visual Objects in VPython Glow script. Posted: May 16, 2025 | Last updated: May 16, 2025. Physics and Python stuff. Most of the videos here are either adapted from class lectures ...

As you can see, it would be a Big Win if Web VPython could use your mechanism, thereby 1) being significantly more conformant to genuine Python and 2) making it possible to import Python modules.