anchor.diff:  
     checkInputs = [
       flask_testing
  -  ];
  +  ] ++ lib.optionals isPy27 [ mock ];
   
     passthru.tests = {
       inherit (nixosTests) ihatemoney;
  
positive.code: { buildPythonPackage, lib, fetchFromGitHub, nixosTests
  , alembic
  , aniso8601
  , Babel
  
negative.code: , jinja2
  , Mako
  , markupsafe
  , mock
  , python-dateutil
  , pytz
  , six
  