There seem to be two classes of such tools:

1. Python interpreters written in JavaScript. These include Brython [1], Skulpt [2] and Batavia [3].

2. Compilers (a.k.a. transpilers) that convert Python code directly into JavaScript. I would expect this to provide better performance than an interpreter, but perhaps be a less accurate Python implementation. This seems to be the approach taken by Transcrypt [4].

Has anyone used any of the above, or similar tools? How did you find them in terms of compatibility, performance etc?

  [1] https://brython.info/
  [2] https://skulpt.org/
  [3] https://github.com/beeware/batavia
  [4] https://www.transcrypt.org/