It doesn't stop there either I've seen python projects using nothing, virtualenv, venv, pip-tools, and pipenv.
I finally feel like pipenv is the true solution and it seems very new. All that said and Python is quite old relative to Go.
* a central package registry
* a file to describe dependencies
* a command line tool to install, build and publish packages
In Python things are more fragmented. You have:
* a central package registry
* a file to store some of your dependencies (Pipfile)
* a command line tool to install packages (Pipenv)
* a file called setup.py in which you need to specify your dependencies again (in another format). You can execute this file to build/publish packages.
It think it would allow for a much nicer user experience if pipenv/pipfile would handle packaging/building/publishing as well..