[giaour]

Understood; I put "better Python" in scare quotes because everyone has their own vision of what that "better X" would look like in an ideal world. Julia offers a python-like syntax but doesn't really attempt to duplicate the python developer experience.

Based on your other comments, if you're OK with a more Ruby-flavored syntax, you could look at Elixir. Its designers put a lot of effort into pervasive immutability and a solid developer experience.