anchor.diff: -{ stdenv, fetchFromGitHub, pythonPackages }:
  +{ stdenv, fetchFromGitHub, python3Packages }:
   
  -with pythonPackages;
  +with python3Packages;
   buildPythonApplication rec {
     version = "1.23.0";
  -  name = "rtv-${version}";
  +  pname = "rtv";
   
     src = fetchFromGitHub {
       owner = "michael-lazar";
  
positive.code:   ];
  
    propagatedBuildInputs = [
      backports_functools_lru_cache
      beautifulsoup4
      configparser
      contextlib2
      decorator
      kitchen
      mailcap-fix
      mccabe
      requests
      six
      tornado
      pyyaml
    ];
  
    meta = with stdenv.lib; {
  
negative.code:     py.test
    '';
  
    checkInputs = [
      coverage
      coveralls
      docopt
  