anchor.diff:  { stdenv
   , buildPythonPackage
   , fetchPyPi
  +, lib
   
   , babelfish
   , pytestrunner
  
positive.code: 
    doCheck = false;
  
    meta = with stdenv.lib; {
      description = "A library for guessing information from video filenames";
      homepage = https://pypi.python.org/pypi/guessit;
      license = licenses.lgpl3;
  
negative.code:   src = fetchPyPi {
      package = "guessit";
      inherit version;
      sha256 = "cdb51ced109e05318f35dc5ee1c50182a85edd800e86de77ec96eb68a0a99391";
    };
  
    nativeBuildInputs = optionals doCheck [
      pytest
      pytest-benchmark
      pytest-capturelog
  