anchor.diff:    });
   
     tweepy = buildPythonPackage (rec {
  -    name = "tweepy-2.0";
  +    name = "tweepy-2.1";
   
       src = fetchurl {
         url = "http://pypi.python.org/packages/source/t/tweepy/${name}.tar.gz";
  -      sha256 = "1b95xcw11b5871gd4br78hxbvcq8y9f0i0sqga85dgg9hnmvdcx0";
  +      sha256 = "1irzwfva7g1k7db708mlxy2qribd6938zwn5xzjzn6i43j5mjysm";
       };
   
       meta = {
  
positive.code: 
  
    repoze_lru = buildPythonPackage rec {
      name = "repoze.lru-0.4";
  
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/r/repoze.lru/${name}.tar.gz";
        md5 = "9f6ab7a4ff871ba795cadf56c20fb0f0";
      };
  
      meta = {
  
negative.code: 
  
    tissue = buildPythonPackage rec {
      name = "tissue-0.9.2";
      src = fetchurl {
        url = "http://pypi.python.org/packages/source/t/tissue/${name}.tar.gz";
        md5 = "87dbcdafff41bfa1b424413f79aa9153";
      };
  
      buildInputs = [ nose ];
  