This is not hard to write if you care about it (dispatching on data in addition to dispatching on type). Clojure-style multimethods with python-style type dispa

This is not hard to write if you care about it (dispatching on data in addition to dispatching on type). Clojure-style multimethods with python-style type dispatch or data result dispatch can be had for under 150 lines. It's not particularly useful unless you are porting code or otherwise writing very unpythonic code.