`pythonPackages.foobar` vs `python3.pkgs.foobar` vs using `withPackages`?

[jonringer]

@dschrempf

I want to have all stated libraries available, I guess I need to use pythonX.withPackages in the system or user configuration. Is that so?

Yes. If you want to install it as part of the “system”, please refer to nixpkgs/doc/languages-frameworks/python.section.md at d1f97a5eb5115289071d8449f26e7b92ce6b6709 · NixOS/nixpkgs · GitHub