Programming language dialects - in Lisp, ML, but not in Python

One of the more unusual features of Lisp is that it supports dialects.
-- Rich Hickey

That really is something to think about when it comes to programming languages.

I would add that the ML family (as in "meta-language", not "machine learning") also has dialects: SML (Standard ML), OCaml, F# (now an official on the Microsoft stack)

Like, it can't be said that C++ is a "dialect" of C...What is the dialect of Python, for example?