```nix
with import <nixpkgs> {};
with python3Packages;

let
  certbot-s3front = buildPythonPackage rec {
    pname = "certbot-s3front";
    version = "0.17.1";
    src = python35.pkgs.fetchPypi {
      inherit pname version;
      sha256 = "8b77ef281375db22634952ff9e569d6c4cd83cc4ae40212a7c70be0b7ea49e0b";
    };
  };
in {
  # ...
  home.packages = [
    pkgs.certbot
    certbot-s3front
  ];
  # ...
}
```