{
  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 ++ [
      ];

      docker_build = pkgs.writeShellScriptBin "docker_build" ''
        docker build -t fastapi .
      '';

      docker_run = pkgs.writeShellScriptBin "docker_run" ''
        docker run -it -p 7860:7860 fastapi
      '';

      docker_refresh = pkgs.writeShellScriptBin "docker_refresh" ''
        docker_build
        docker_run
      '';
    in
    {
      devShell = with pkgs;
        mkShell {
          buildInputs = [
            devPackages
            docker_run
            docker_build
            docker_refresh
          ];
        };
    }
  );
}