flake.nix

{
  description = "A very basic flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs.inputs.nixpkgs.follows = "nixpkgs";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
    let
      pkgs = import nixpkgs {
        inherit system;
      };
      pythonPackages = pkgs.python39Packages;
      runPackages = with nixpkgs; [
        pythonPackages.python
      ];
      devPackages = with nixpkgs; runPackages ++ [
        pythonPackages.pip
      ];
    in
    {
      devShell = with pkgs; mkShell {
        buildInputs = [
          devPackages
        ];
      };
    }
  );
}