anchor.diff:      pytest
       pytest-aiohttp
       pytest-asyncio
  +    pytestCheckHook
     ];
   
     meta = with stdenv.lib; {
  
positive.code: 
  buildPythonPackage rec {
    pname = "pyatv";
    version = "v0.7.4";
  
    src = fetchFromGitHub {
      owner = "postlund";
      repo = pname;
      rev = version;
      sha256 = "17gsamn4aibsx4w50r9dwr5kr9anc7dd0f0dvmdl717rkgh13zyi";
    };
  
  
negative.code:     cryptography
      netifaces
      zeroconf
    ];
  
    checkInputs = [
  