let
  unstablePkgs = import <nixpkgs> {};
  python-unstable3 = unstablePkgs.python3;
  beancount-python-packages = python-packages: with python-packages; [
    beancount
    flake8
    inflect
    isort
    jedi
    pylint
    virtualenv
    yapf
    yamllint
  ];
  beancount-python = python-unstable3.withPackages beancount-python-packages;
in
unstablePkgs.stdenv.mkDerivation {
  name = "beancount-python";
  buildInputs = [ beancount-python ];
}