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The python documentation is usually up-to-date and mostly comprehensive https://github.com/NixOS/nixpkgs/blob/master/doc/languages-frameworks/python.section.md
For node programs, you may be able to find the commands as just packages, or look at https://github.com/svanderburg/node2nix for creating the nix equivalent of a node-modules
I usually got by with the python stuff in nixpkgs. Other than that for applications I would probably recommend poetry2nix as mentioned. For the nodejs I would use https://github.com/serokell/nix-npm-buildpackage