Speaking to Python from other realms like Clojure and Mathematica.
Adapted from Adam Bard's work at https://unpythonic.com/02_02_multimethods/, with clarifications, corrections, and unit tests.
Clojure-style multimethods with arbitrary dispatch keys. See 'test_locutius.py' for usage examples.
pip install locutius
Requires Python 3, preferably 3.6 or later.