Nix is not only a package manager, but also a build automation tool, and you can use it to build polyglot data science pipelines in a completely reproducible way.
For example, suppose that you need to mix Python, R and maybe some others tools for a project (by the way, some believe this will become the norm in the coming years, use your favourite search engine to look for “polyglot data science” and you’ll see), and suppose that you want to define your project as a …