anchor.diff:  
   
     munkres = buildPythonPackage rec {
  -    name = "munkres-1.0.5.4";
  +    name = "munkres-1.0.6";
   
       src = fetchurl {
         url = "http://pypi.python.org/packages/source/m/munkres/${name}.tar.gz";
  -      md5 = "cb9d114fb523428bab4742e88bc83696";
  +      md5 = "d7ba3b8c5001578ae229a2d5a655872f";
       };
   
       # error: invalid command 'test'
  
positive.code:       url = "http://pypi.python.org/packages/source/m/musicbrainzngs/${name}.tar.gz";
        md5 = "9e17a181af72d04a291c9a960bc73d44";
      };
  
      meta = {
        homepage = http://alastair/python-musicbrainz-ngs;
  
negative.code: 
  
    alembic = buildPythonPackage rec {
      name = "alembic-0.6.6";
  
      src = fetchurl {
        url = "https://pypi.python.org/packages/source/a/alembic/${name}.tar.gz";
        md5 = "71e4a8f6849e1527abfc4ea33d51f37c";
      };
  
      buildInputs = [ nose mock ];
      propagatedBuildInputs = [ Mako sqlalchemy9 ];
  
      meta = {
        homepage = http://bitbucket.org/zzzeek/alembic;
  