anchor.diff:    ] ++ lib.optionals stdenv.isDarwin [
       "test_xmliter_encoding"
       "test_download"
  +    "test_reactor_default_twisted_reactor_select"
     ];
   
     postInstall = ''
  
positive.code: 
  buildPythonPackage rec {
    pname = "scrapy";
    version = "2.6.1";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  
negative.code:   src = fetchPypi {
      inherit version;
      pname = "Scrapy";
      sha256 = "55e21181165f25337105fff1efc8393296375cea7de699a7e703bbd265595f26";
    };
  
    nativeBuildInputs = [
  