human
I wrote the below code

    if (alphabet is None):
        alphabet = single_letter_alphabet
    state_PREAMBLE = (-1)
    state_NONE = 0
    state_QUERY_HEADER = 1
    state_ALIGN_HEADER = 2
    state_ALIGN_QUERY = 3
    state_ALIGN_MATCH = 4
    state_ALIGN_CONS = 5
    def build_hsp():
        if ((not query_tags) and (not match_tags)):
            raise ValueError(('No    data    for    query    %r,    match    %r' % (query_id, match_id)))
        assert query_tags, query_tags
        assert match_tags, match_tags
        evalue = align_tags.get('fa_expect')
        q = '?'
        m = '?'
        tool = global_tags.get('tool', '').upper()
        try:
            q = _extract_alignment_region(query_seq, query_tags)
            if ((tool in ['TFASTX']) and (len(match_seq) == len(q))):
                m = match_seq
            else:
                m = _extract_alignment_region(match_seq, match_tags)
            assert (len(q) == len(m))
        except AssertionError as err:
            print('Darn...    amino    acids    vs    nucleotide    coordinates?')
            print(tool)
            print(query_seq)
            print(query_tags)
            print(('%s    %i' % (q, len(q))))
            print(match_seq)
            print(match_tags)
            print(('%s    %i' % (m, len(m))))
            print(handle.name)
            raise err
        assert (alphabet is not None)
        alignment = MultipleSeqAlignment([], alphabet)
        alignment._annotations = {}
        for (key, value) in header_tags.items():
            alignment._annotations[key] = value
        for (key, value) in align_tags.items():
            alignment._annotations[key] = value
        record = SeqRecord(Seq(q, alphabet), id=query_id, name='query', description=query_descr, annotations={'original_length': int(query_tags['sq_len'])})
        record._al_start = int(query_tags['al_start'])
        record._al_stop = int(query_tags['al_stop'])
        alignment.append(record)
        if ((alphabet == single_letter_alphabet) and ('sq_type' in query_tags)):
    ...

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def FastaM10Iterator(handle, alphabet=single_letter_alphabet):