anchor.diff:    };
   
     oslo-serialization = buildPythonPackage rec {
  -    name = "oslo.serialization-${version}";
  -    version = "1.10.0";
  -
  -    src = pkgs.fetchurl {
  -      url = "mirror://pypi/o/oslo.serialization/${name}.tar.gz";
  -      sha256 = "15k8aql2rx5jzv3hfvmd48vsyw172qa64bs3fmsyx25p37zyfy8a";
  +    pname = "oslo.serialization";
  +    version = "2.20.0";
  +    name = "${pname}-${version}";
  +
  +    src = fetchPypi {
  +      inherit pname version;
  +      sha256 = "00j8hn8f0shk4anzb6zwn8w1sfxcil9a3jgxljwalq6ma2rzp9pw";
       };
   
       patchPhase = ''
  
positive.code:   };
  
    oslo-context = buildPythonPackage rec {
      name = "oslo.context-${version}";
      version = "0.7.0";
  
      src = pkgs.fetchurl {
        url = "mirror://pypi/o/oslo.context/${name}.tar.gz";
        sha256 = "18fmg9dhgngshk63wfb3ddrgx5br8jxkk3x30z40741mslp1fdjy";
      };
  
      propagatedBuildInputs = with self; [ pbr Babel ];
  
negative.code:   ropper = callPackage ../development/python-modules/ropper { };
  
    routes = buildPythonPackage rec {
      pname = "Routes";
      version = "2.4.1";
      name = "${pname}-${version}";
  
      src = fetchPypi {
        inherit pname version;
        sha256 = "1zamff3m0kc4vyfniyhxpkkcqv1rrgnmh37ykxv34nna1ws47vi6";
      };
  
      propagatedBuildInputs = with self; [ paste webtest repoze_lru ];
  
      meta = {
        description = "A Python re-implementation of the Rails routes system for mapping URLs to application actions";
  