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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def epd(self, *, shredder: bool = False, en_passant: str = "legal", promoted: Optional[bool] = None, **operations: Union[None, str, int, float, Move, Iterable[Move]]) -> str: """ Gets an EPD representation of the current position. See :func:`~chess.Board.fen()` for FEN formatting options (*shredder*, *ep_square* and *promoted*). EPD operations can be given as keyword arguments. Supported operands are strings, integers, floats, moves, lists of moves and ``None``. All other operands are converted to strings. A list of moves for *pv* will be interpreted as a variation. All other move lists are interpreted as a set of moves in the current position. *hmvc* and *fmvc* are not included by default. You can use: 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - hmvc 0; fmvc 1;' """

        if en_passant == "fen":
            ep_square = self.ep_square
        elif en_passant == "xfen":
            ep_square = self.ep_square if self.has_pseudo_legal_en_passant() else None
        else:
            ep_square = self.ep_square if self.has_legal_en_passant() else None

        epd = [self.board_fen(promoted=promoted),
               "w" if self.turn == WHITE else "b",
               self.castling_shredder_fen() if shredder else self.castling_xfen(),
               SQUARE_NAMES[ep_square] if ep_square is not None else "-"]

        if operations:
            epd.append(self._epd_operations(operations))

        return " ".join(epd)