anchor.diff:  
   in buildPythonPackage rec {
     name = "beets-${version}";
  -  version = "1.3.16";
  +  version = "1.3.17";
     namePrefix = "";
   
     src = fetchFromGitHub {
       owner = "sampsyo";
       repo = "beets";
       rev = "v${version}";
  -    sha256 = "1grjcgr419yq756wwxjpzyfjdf8n51bg6i0agm465lb7l3jgqy6k";
  +    sha256 = "1fskxx5xxjqf4xmfjrinh7idjiq6qncb24hiyccv09l47fr1yipc";
     };
   
     propagatedBuildInputs = [
  
positive.code:       test/test_replaygain.py
    '';
  
    doCheck = true;
  
    preCheck = ''
      (${concatMapStrings (s: "echo \"${s}\";") allPlugins}) \
  
negative.code:     python.modules.readline
    ] ++ optional enableAcoustid     pythonPackages.pyacoustid
      ++ optional (enableFetchart
                || enableEmbyupdate
                || enableAcousticbrainz)
                                     pythonPackages.requests2
      ++ optional enableDiscogs      pythonPackages.discogs_client
      ++ optional enableEchonest     pythonPackages.pyechonest
      ++ optional enableLastfm       pythonPackages.pylast
  