anchor.diff:  buildPythonPackage rec {
     pname = "openpyxl";
     version = "3.0.0";
  +  disabled = isPy27; # 2.6.4 was final python2 release
   
     src = fetchPypi {
       inherit pname version;
  
positive.code:     license = lib.licenses.mit;
      maintainers = with lib.maintainers; [ lihop sjourdois ];
    };
  }
negative.code: { lib
  , buildPythonPackage
  , fetchPypi
  , isPy27
  , pytest
  , jdcal
  , et_xmlfile
  