anchor.diff:  
     propagatedBuildInputs = [
       celery
  +    humanize
  +    prometheus-client
       pytz
       tornado
  -    humanize
  -    prometheus-client
     ];
   
     checkInputs = [
  
positive.code: buildPythonPackage rec {
    pname = "flower";
    version = "1.0.0";
  
    src = fetchPypi {
      inherit pname version;
  
negative.code:     pytestCheckHook
    ];
  
    disabledTests = [
      # AssertionError as the celery release can't be detected
      "test_default"
      "test_with_app"
    ];
  
    pythonImportsCheck = [
      "flower"
    ];
  
    meta = with lib; {
      description = "Celery Flower";
  