{ pkgs }:

let my-python-packages = python-packages: with python-packages; [
  pip
  mathlibtools
];
in

let packageOverrides = self: super: {
  # Test failures on darwin ("windows-1252"); just skip pytest
  # (required for elan)
  beautifulsoup4 = super.beautifulsoup4.overridePythonAttrs(old: { pytestCheckPhase="true"; });
};
in

(pkgs.python3.override { inherit packageOverrides; }).withPackages my-python-packages