anchor.diff:  , buildPythonPackage
   , fetchPypi
   , pytest
  +, CommonMark
   , bleach
   , docutils
   , pygments
  
positive.code:     homepage = https://github.com/pypa/readme_renderer;
      license = lib.licenses.asl20;
    };
  }
negative.code: 
  buildPythonPackage rec {
    pname = "readme_renderer";
    version = "17.4";
  
    src = fetchPypi {
      inherit pname version;
      sha256 = "82d68175feec897af2a38fe8590778f14c3be5324cc62e3ce5752a9b1e4b60ab";
    };
  
    checkInputs = [ pytest ];
  
    propagatedBuildInputs = [
      CommonMark bleach docutils pygments six
    ];
  
    checkPhase = ''
  