Not really packaging but related, my favourite new tool is Pyenv (https://github.com/pyenv/pyenv) it made getting a new laptop setup with various versions of Python so much quicker.
I haven’t used Pipenv yet but it works with pyenv to create virtual envs with a specified puthon version as well as all the correct packages.
Polyglots might also be interested in asdf (https://github.com/asdf-vm/asdf). It's like Pyenv but supports various languages via a plugin system (eg. https://github.com/danhper/asdf-python).