anchor.diff:    ] ++ lib.optionals stdenv.isDarwin [
       "test_xmliter_encoding"
       "test_download"
  +    "test_reactor_default_twisted_reactor_select"
     ];
   
     postInstall = ''
  
positive.code:   src = fetchPypi {
      inherit version;
      pname = "Scrapy";
      sha256 = "56fd55a59d0f329ce752892358abee5a6b50b4fc55a40420ea317dc617553827";
    };
  
    nativeBuildInputs = [
  
negative.code: 
  buildPythonPackage rec {
    pname = "scrapy";
    version = "2.6.2";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  