anchor.diff:  
     rply = callPackage ../development/python-modules/rply/default.nix {};
   
  -  rpm = (pkgs.rpm.override{inherit python;});
  +  rpm = toPythonModule (pkgs.rpm.override{inherit python;});
   
     rpmfluff = callPackage ../development/python-modules/rpmfluff {};
   
  
positive.code:     propagatedBuildInputs = with self; [ pyusb ];
    };
  
    opencv = pkgs.opencv.override {
      enablePython = true;
      pythonPackages = self;
    };
  
    opencv3 = pkgs.opencv3.override {
      enablePython = true;
      pythonPackages = self;
    };
  
    openidc-client = callPackage ../development/python-modules/openidc-client/default.nix {};
  
  
negative.code:     };
    };
  
    grib-api = if (isPy27) then toPythonModule
      (pkgs.grib-api.override {
        enablePython = true;
        pythonPackages = self;
      }) else throw "grib-api not supported for interpreter ${python.executable}";
  
    gspread = buildPythonPackage rec {
      version = "0.2.3";
  