{
  description = "My python development shell";
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
  };
  outputs = {nixpkgs, ...}: let
    system = "x86_64-linux";
    pkgs = import nixpkgs {
      inherit system;
    };
    pythonEnv = pkgs.python3.withPackages (python-pkgs: [
      python-pkgs.numpy
      python-pkgs.pandas
    ]);
  in {
    packages."${system}" = {
      default = pkgs.writeShellApplication {
        name = "my-app";
        runtimeInputs = [pythonEnv];
        text = ''
          python ${./main.py} "$@"
        '';
      };
    };

    devShells."${system}" = {
      default = pkgs.mkShell {
        packages = [pythonEnv];
      };
    };
  };
}