anchor.diff:  { lib
   , buildPythonPackage
   , fetchFromGitHub
  -, isPy27
  +, pythonOlder
   , w3lib
   , parsel
   , jmespath
  
positive.code: buildPythonPackage rec {
    pname = "itemloaders";
    version = "1.0.4";
  
    disabled = isPy27;
  
    # Tests not included in PyPI tarball
    src = fetchFromGitHub {
  
negative.code: 
    checkInputs = [ pytestCheckHook ];
  
    disabledTests = [
      # Test are failing (AssertionError: Lists differ: ...)
      "test_nested_css"
      "test_nested_xpath"
    ];
  
    pythonImportsCheck = [ "itemloaders" ];
  
    meta = with lib; {
      description = "Base library for scrapy's ItemLoader";
      homepage = "https://github.com/scrapy/itemloaders";
  