gistfile1.txt

{ pkgs ? import <nixpkgs> { }, pythonPackages ? pkgs.python3Packages }:

let pythonEnv = pythonPackages.python.withPackages
                  (ps: with ps; [ numpy jupyterlab ]);
in {

 shell = pkgs.mkShell {
   buildInputs = [ pythonEnv ];
 };

 # https://grahamc.com/blog/nix-and-layered-docker-images
 # docker
 #  - docker load < ./result
 #  - docker run -it
 docker = pkgs.dockerTools.buildLayeredImage {
   name = "numpy-example";
   tag = "latest";
   config.Cmd = [ "${pythonEnv.interpreter}" ];
   maxLayers = 120;
 };

}