<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def parse_ddo(ont_id: str, serialized_ddo: str or bytes) -> dict: """ This interface is used to deserialize a hexadecimal string into a DDO object in the from of dict. :param ont_id: the unique ID for identity. :param serialized_ddo: an serialized description object of ONT ID in form of str or bytes. :return: a description object of ONT ID in the from of dict. """

        if len(serialized_ddo) == 0:
            return dict()
        if isinstance(serialized_ddo, str):
            stream = StreamManager.get_stream(bytearray.fromhex(serialized_ddo))
        elif isinstance(serialized_ddo, bytes):
            stream = StreamManager.get_stream(serialized_ddo)
        else:
            raise SDKException(ErrorCode.params_type_error('bytes or str parameter is required.'))
        reader = BinaryReader(stream)
        try:
            public_key_bytes = reader.read_var_bytes()
        except SDKException:
            public_key_bytes = b''
        try:
            attribute_bytes = reader.read_var_bytes()
        except SDKException:
            attribute_bytes = b''
        try:
            recovery_bytes = reader.read_var_bytes()
        except SDKException:
            recovery_bytes = b''
        if len(recovery_bytes) != 0:
            b58_recovery = Address(recovery_bytes).b58encode()
        else:
            b58_recovery = ''
        pub_keys = OntId.parse_pub_keys(ont_id, public_key_bytes)
        attribute_list = OntId.parse_attributes(attribute_bytes)
        ddo = dict(Owners=pub_keys, Attributes=attribute_list, Recovery=b58_recovery, OntId=ont_id)
        return ddo