EDIT - I asked 9 months ago and the top comment recommended pipenv and flit:
https://news.ycombinator.com/item?id=18612590
I just use pythons integrated venv and pip, which work fine for me. However, it was in that same thread (the link posted in this comment) which suggested poetry and another I believe, which I do feel like trying out.
Definitely give poetry a shot, it's really good. In particular, I enjoy how the maintainer engages with the community and is receptive to feedback. He's pretty good about adding features to satisfy the users, rather than handwaving legitimate concerns in one-line responses.