anchor.diff:  , buildPythonPackage
   , fetchPypi
   , six
  -, pytest
  +, pytestCheckHook
   }:
   
   buildPythonPackage rec {
  
positive.code:     sha256 = "1pv02lvvmgz2qb61vz1jkjc04fgm4hpfvaj5zm4i3mjp64hd1mha";
    };
  
    buildInputs = [ six pytest ];
  
    meta = with lib; {
      description = "A library of web-related functions";
  
negative.code:     license = licenses.bsd3;
      maintainers = with maintainers; [ drewkett ];
    };
  }
  