pipenv really solves the Python version problem, IIRC. I don't actually use pipenv, myself, since I haven't had time to thoroughly figure out the new magic and

pipenv really solves the Python version problem, IIRC. I don't actually use pipenv, myself, since I haven't had time to thoroughly figure out the new magic and I prefer to know exactly what's going on with my Python's. npm doesn't solve the duplicating of deps any better than python/pip, as far as I know. The react-native app I'm currently working on has a node_modules folder at 960Mb. That's probably bigger than nearly every virtualenv I've ever seen. A react-native node_modules on a bare project with `--template typescript` is at least 350Mb (created one a few minutes ago). I'm using nvm for node version management. No problems so far.