deps.nix

with (import <nixpkgs> {}).pkgs;

let
  importDeps = stdenv.mkDerivation {
      name = "importDeps";
      src = fetchurl {
         url = "file:///home/tom/testbed/nix-import-stuff/ext.zip";
         sha256 = "0ivhsn2pp1sgzsywnd2x673ff5q62v9715kkw5vyf63rfh7fw9h4";
      };
      phases = "unpackPhase installPhase";
      buildInputs = [ unzip ];
      installPhase = ''
        mkdir -p $out
        cp *nix $out
      '';
  };

in

buildPythonPackage rec {
  name = "Hello";
  srcs = fetchurl {
     url = "file:///home/tom/testbed/nix-import-stuff/ext.zip";
     sha256 = "0ivhsn2pp1sgzsywnd2x673ff5q62v9715kkw5vyf63rfh7fw9h4";
  };
  deps = import "${importDeps}/deps.nix" { pythonPackages = pythonPackages; };
  buildInputs = [ unzip
  ] ++ deps;
}