anchor.diff:  
     terminaltables = buildPythonPackage {
       name = "terminaltables-2.1.0";
  -    buildInputs = with self; [];
  +    buildInputs = [];
       doCheck = false;
  -    propagatedBuildInputs = with self; [];
  +    propagatedBuildInputs = [];
       src = fetchurl {
         url = "https://pypi.python.org/packages/10/da/9bbb21c1c2f9be4df2056b00b569689b9ece538ef39bf8db34be25f9e850/terminaltables-2.1.0.tar.gz";
         md5 = "651dadab3eb3ddf21c28374a9002a30f";
  
positive.code: 
      src = ./.;
  
      propagatedBuildInputs = with self;
        [ requests2 futures click dpath terminaltables ];
  
      meta = {
  
negative.code: 
    dpath = buildPythonPackage {
      name = "dpath-1.4.0";
      buildInputs = [];
      doCheck = false;
      propagatedBuildInputs = [];
      src = fetchurl {
        url = "https://pypi.python.org/packages/6d/3a/d599d29897bf3c7f3a0ddc78f2d2297ebc05b20b875f272f5d8010b77cbe/dpath-1.4.0.tar.gz";
        md5 = "9725730d39d09690a87c983bcf02b672";
  