anchor.diff:  
       src = pkgs.fetchurl {
         url = "http://pypi.python.org/packages/source/n/nipype/${name}.tar.gz";
  -      md5 = "480013709633a6d292e2ef668443e0c9";
  +      sha256 = "7fb143cd4d05f18db1cb7f0b83dba13d3dcf55b4eb3d16df08c97033ccae507b";
       };
   
       # Tests fail due to getcwd returning ENOENT???
  
positive.code:     version = "1.9.0";
      src = pkgs.fetchurl {
        url = "https://pypi.python.org/packages/source/e/elpy/${name}.tar.gz";
        md5 = "651f6f46767b7132e5c0f83d5ac3b1f7";
      };
      python2Deps = if isPy3k then [ ] else [ self.rope ];
      propagatedBuildInputs = with self; [ flake8 autopep8 jedi importmagic ] ++ python2Deps;
  
negative.code: 
      src = pkgs.fetchurl {
        url = "https://pypi.python.org/packages/source/t/timelib/${name}.zip";
        sha256 = "49142233bdb5971d64a41e05a1f80a408a02be0dc7d9f8c99e7bdd0613ba81cb";
      };
  
      buildInputs = with self; [ ];
  