let
  sources = import ./nix/sources.nix;
  pkgs = import sources.nixpkgs {};
  # Let all API attributes like "poetry2nix.mkPoetryApplication"
  # use the packages and versions (python3, poetry etc.) from our pinned nixpkgs above
  # under the hood:
  poetry2nix = import sources.poetry2nix {inherit pkgs;};
  myPythonApp = poetry2nix.mkPoetryApplication {projectDir = ./.;};
in
  myPythonApp