my shell.nix for haskpy

shell-v2.nix

let
  pkgs = import <nixpkgs> {};

  haskpy = ps: ps.buildPythonPackage rec {
    name = "haskpy";
    doCheck = false;
    src = ./.;
    propagatedBuildInputs = with ps; [
      attrs
    ];
  };

  pythonEnv = pkgs.python3.withPackages (ps: with ps; [
    (haskpy ps)
    ipython
    pytest
    pip
    versioneer
    twine
    sphinx
    attrs
    hypothesis
    toolz
    cytoolz
  ]);

in pkgs.mkShell {
  buildInputs = [
    pythonEnv
  ];
}

shell.nix

let
  pkgs = import <nixpkgs> {};
  pythonPackages = pkgs.python3Packages;
in pythonPackages.buildPythonPackage rec {
  name = "haskpy";
  doCheck = false;
  src = ./.;
  propagatedBuildInputs = with pythonPackages; [
    ipython
    pytest
    pip
    versioneer
    twine
    sphinx
  ];
  buildInputs = with pythonPackages; [
    attrs
    hypothesis
    toolz
    cytoolz
  ];
}