You’ve seen a couple descriptions in the sibling comments to this one, and it probably sounds like what you feel about python/ruby/whatever. But you really should try lisp with editor integration. Or, try some smalltalk for a lot of the same feel. Smalltalk has better integrated tooling, though I’d argue lisp through swank feels nicer. The common spiel sounds so similar to regular repls, but feels profoundly better in practice. I always thought of languages using repls as toys prior to earning common lisp.