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Complete this python program:
def FastaM10Iterator(handle, alphabet=single_letter_alphabet):
assistant
#Here is the Python code you requested.

    """Alignment iterator for the FASTA tool\s pairwise alignment output.
    This is for reading the pairwise alignments output by Bill Pearson\s
    FASTA program when called with the -m 10 command line option for machine
    readable output.  For more details about the FASTA tools, see the website
    http://fasta.bioch.virginia.edu/ and the paper:
    W.R. Pearson & D.J. Lipman PNAS (1988) 85:2444-2448
    This class is intended to be used via the Bio.AlignIO.parse() function
    by specifying the format as "fasta-m10" as shown in the following code::
    from Bio import AlignIO
    handle = ...
    for a in AlignIO.parse(handle, "fasta-m10"):
    assert len(a) == 2, "Should be pairwise!"
    print("Alignment length %i" % a.get_alignment_length())
    for record in a:
    print("%s %s %s" % (record.seq, record.name, record.id))
    Note that this is not a full blown parser for all the information
    in the FASTA output - for example, most of the header and all of the
    footer is ignored.  Also, the alignments are not batched according to
    the input queries.
    Also note that there can be up to about 30 letters of flanking region
    included in the raw FASTA output as contextual information.  This is NOT
    part of the alignment itself, and is not included in the resulting
    MultipleSeqAlignment objects returned.
    """
    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)):
    ...