human
Complete this python program:
def main():
assistant
#Here is the Python code you requested.

    """Parse command line arguments
    """
    def handle_op_arg(option, opt_str, value, parser, opname):
        if parser.values.op:
            raise optparse.OptionValueError(('Only    one    of    --probe,    --scan,    --nopen,    or    --cleanup    should    ' + 'be    supplied'))
        parser.values.op = opname
    parser = optparse.OptionParser(version=VERSION, usage='%prog    [options]\n\nSee    -h    for    specific    options    (some    of    which    are    required).\n\nExamples:\n\nScan    to    find    (unknown    versions)    or    confirm    (known    versions)    vulnerability:\n        %prog    -t    1.2.3.4    -e    012-345-6789    --scan    -v\n\nOnce    a    valid    entry    is    in    ELBO.config,    upload    nopen:\n        %prog    -t    1.2.3.4    -e    012-345-6789    --nopen    -n    noserver    -c    5.6.7.8:12345    -v\n\nDelete    uploaded    files    from    the    previous    step:\n        %prog    -t    1.2.3.4    -e    012-345-6789    --cleanup    -v')
    parser.add_option('-t', '--target-ip', dest='target_ip', action='store', type='string', help="Target's    IP    address")
    parser.add_option('-e', '--etag', dest='etag', action='store', type='string', help="Target's    ETag    string")
    parser.add_option('--scan', dest='op', action='callback', callback=handle_op_arg, callback_args=('scan',), help='Scan    for    vulnerability    parameters')
    parser.add_option('--delay', dest='delay', action='store', type='int', default=1, help=('Delay    in    seconds    between    probes    ' + 'during    --scan    (default=1    second)'))
    parser.add_option('-f', '--max-fails', dest='maxfails', action='store', type='int', default=0, help=(('Total    maximum    number    of    ' + 'failed    scan    attempts    before    aborting    (default=0,    run    ') + 'all    scans);    see    also    --max-fails-action'))
    parser.add_option('--max-fails-action', dest='maxfailsaction', action='store', type='int', default=0, help=((('Maximum    ' + 'number    of    failed    scan    attempts    on    a    single   ...