anchor.diff:      pyopenssl
       queuelib
       service-identity
  +    tldextract
       twisted
       w3lib
       zope_interface
  
positive.code: 
  buildPythonPackage rec {
    pname = "scrapy";
    version = "2.5.1";
    disabled = pythonOlder "3.6";
  
    src = fetchPypi {
      inherit version;
      pname = "Scrapy";
      sha256 = "13af6032476ab4256158220e530411290b3b934dd602bb6dacacbf6d16141f49";
    };
  
    nativeBuildInputs = [
  
negative.code:     pytestCheckHook
      sybil
      testfixtures
    ];
  
    LC_ALL = "en_US.UTF-8";
  