How to use the pycantonese.jyutping.parse_final function in pycantonese

if initial:
            onset = initial

        # determine jp_search_tuple
        if jyutping:
            try:
                jp_search_list = parse_jyutping(jyutping)
            except ValueError:
                raise ValueError("invalid jyutping -- %s" % (repr(jyutping)))
            if len(jp_search_list) > 1:
                raise ValueError("only jyutping for one character is allowed")
            else:
                jp_search_tuple = jp_search_list[0]
        else:
            if final:
                nucleus, coda = parse_final(final)
            jp_search_tuple = (onset, nucleus, coda, tone)

    fn_to_results = {}

    for fn, tagged_sents in fn_to_tagged_sents.items():
        sent_word_index_pairs = []

        for i_sent, tagged_sent in enumerate(tagged_sents):

            for i_word, tagged_word in enumerate(tagged_sent):
                c_characters, c_pos, c_mor, _ = tagged_word  # c = current
                c_jyutping = get_jyutping_from_mor(c_mor)

                # determine character_search and pos_search
                if character_search:
                    character_match = character in c_characters