anchor.diff:  
   
     botocore = buildPythonPackage rec {
  -    name = "botocore-0.5.2";
  -
  -    src = fetchurl {
  -      url = https://github.com/boto/botocore/archive/0.5.2.tar.gz;
  -      sha256 = "18073mydin0mwk1d7vdlmsiz3rvhjzxkaaqrmxw440acbipnngq2";
  -    };
  -
  -    propagatedBuildInputs = [ dateutil requests014 ];
  +    name = "botocore-0.8.3";
  +
  +    src = fetchurl {
  +      url = https://github.com/boto/botocore/archive/0.8.3.tar.gz;
  +      sha256 = "0dbm2clrh7zs4brqqj3xssz3nymdg24ff2lww27s3wliirwqdiv1";
  +    };
  +
  +    propagatedBuildInputs = [ dateutil requests jmespath ];
   
       meta = {
         homepage = https://github.com/boto/botocore;
  
positive.code:   });
  
    awscli = buildPythonPackage rec {
      name = "awscli-0.5.0";
      namePrefix = "";
  
      src = fetchurl {
        url = https://github.com/aws/aws-cli/archive/0.5.0.tar.gz;
        sha256 = "0smgcisl2p7p2y2i299x7g271kdmgs0hnzngw5030phvh0lq202i";
      };
  
      propagatedBuildInputs = [ argparse botocore ];
  
    };
  
  
negative.code:     src = fetchurl {
        url = "http://pypi.python.org/packages/source/r/requests/${name}.tar.gz";
        md5 = "a0158815af244c32041a3147ee09abf3";
      };
  
      meta = {
  