I like how you just stated "this is a native killer feature", and immediately, 2 other comments stated, "well, with a bit of work, we can have half of this kill

I like how you just stated "this is a native killer feature", and immediately, 2 other comments stated, "well, with a bit of work, we can have half of this killer feature too in my language". Come on, I'm a Python fan, but no, we don't have anything close to that Clojure experience. And it's certainly not native anyway. I mean, twisted? Really? I co-wrote the book "Expert Twisted", and even I wouldn't be caught dead pretending it's simple. So how can you advocate to do this + ssh + reload() (which is very unreliable in python) as an alternative to what OP talks about. No language is perfect. Other techs have fascinating promises. Let's stop a moment and admire that instead of trying to sell our stuff all the time.