default.nix

{ pkgs ? import <nixpkgs> {} }:

pkgs.python311.pkgs.callPackage ./hello.nix {}

flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1718428119,
        "narHash": "sha256-WdWDpNaq6u1IPtxtYHHWpl5BmabtpmLnMAx0RdJ/vo8=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "e6cea36f83499eb4e9cd184c8a8e823296b50ad5",
        "type": "github"
      },
      "original": {
        "owner": "NixOS",
        "ref": "nixpkgs-unstable",
        "repo": "nixpkgs",
        "type": "github"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
  };
  outputs = {self, nixpkgs, ...}: {
    packages.x86_64-linux = let
      pkgs = nixpkgs.legacyPackages.x86_64-linux;
    in {
      default = pkgs.python311.pkgs.callPackage ./hello.nix {};
    };
    apps.x86_64-linux.default = {
      type = "app";
      program = "${self.packages.x86_64-linux.default}/bin/hello-bin";
    };
  };
}

hello.nix

{ buildPythonApplication
}:

buildPythonApplication {
  pname = "hello";
  version = "1.0.0";
  src = ./.;
  pythonImportsCheck = ["hello"];
  doCheck = false;
}

hello.py

def hello():
    print('Hello, world!')

if __name__ == '__main__':
    hello()

setup.py

from setuptools import setup

setup(
    name="hello",
    version="1.0.0",
    py_modules=["hello"],
    entry_points={
        'console_scripts': [
            'hello-bin = hello:hello',
        ]
    }
)