anchor.diff:        url = "https://pypi.python.org/packages/8c/af/3ffafe85bcc93ecb09459f3f2bd8fbe142e9ab34048f9e2774543b470cbd/transaction-2.0.3.tar.gz";
         sha256 = "67bfb81309ba9717edbb2ca2e5717c325b78beec0bf19f44e5b4b9410f82df7f";
       };
  -    propagatedBuildInputs = [
  -      zope_interface
  -    ] ++ (with pythonPackages; [ six wheel ]);
  +    propagatedBuildInputs = with pythonPackages; [ zope_interface six wheel ];
       meta = with stdenv.lib; {
         homepage = "";
         license = licenses.zpt21;
  
positive.code:       description = "Fork of Python 3 pickle module.";
      };
    };
  
    zope_interface = pythonPackages.buildPythonPackage {
      name = "zope.interface-4.3.3";
      src = fetchurl {
        url = "https://pypi.python.org/packages/44/af/cea1e18bc0d3be0e0824762d3236f0e61088eeed75287e7b854d65ec9916/zope.interface-4.3.3.tar.gz";
        sha256 = "8780ef68ca8c3fe1abb30c058a59015129d6e04a6b02c2e56b9c7de6078dfa88";
      };
      propagatedBuildInputs = [ ];
      meta = with stdenv.lib; {
        homepage = "";
        license = licenses.zpt21;
        description = "Interfaces for Python";
      };
    };
  }
  
negative.code:       url = "https://pypi.python.org/packages/3d/71/3302512282b606ec4d054e09be24c065915518903b29380b6573bff79c24/persistent-4.2.2.tar.gz";
        sha256 = "52ececc6dbba5ef572d3435189318b4dff07675bafa9620e32f785e147c6563c";
      };
      propagatedBuildInputs = with pythonPackages; [ zope_interface six wheel ];
      meta = with stdenv.lib; {
        homepage = "";
        license = licenses.zpt21;
  