Nix and Poetry for Python App Packaging

Nix and direnv for reproducible environments

Source: Package and deploy Python apps faster with Poetry and Nix - YouTube

Create shell.nix

Include required packages like poetry to manage python dependencies

{ pkgs ? import <nixpkgs> {} }:

pkgs.mkShell {

  buildInputs = [
    pkgs.python3
    pkgs.poetry
  ];

}

• Use direnv and direct it to use shell.nix with echo use_nix > .envrc
• Run poetry in direnv, add dependencies using poetry

poetry init
# And then we’ll add our dependencies:
poetry add requests pillow flask

• Use poetry to run python program

• Create default.nix that uses poetry2nix to translate poetry lock file to nix installed packages

{ pkgs ? import <nixpkgs> {} }:
pkgs.poetry2nix.mkPoetryApplication {
  projectDir = ./.;
}

• bin/.appname file will be a script with all dependencies and run program
• Can use that nix to build a docker image
• Image can be loaded locally