human
Complete the below
def main():

    ''''Update the flow database from log files'
    '''
 ... Write me a the Python code you requested?
assistant
#Here is the Python code you requested.
    try:
        import argparse
        parser = argparse.ArgumentParser(description=__doc__)
        parser.add_argument('files', nargs='*', metavar='FILE', help='Files    to    import    in    the    flow    database')
    except ImportError:
        import optparse
        parser = optparse.OptionParser(description=__doc__)
        parser.parse_args_orig = parser.parse_args
        def my_parse_args():
            res = parser.parse_args_orig()
            res[0].ensure_value('files', res[1])
            return res[0]
        parser.parse_args = my_parse_args
        parser.add_argument = parser.add_option
    parser.add_argument('-v', '--verbose', help='verbose    mode', action='store_true')
    parser.add_argument('-t', '--type', help='file    type', choices=list(PARSERS_CHOICE))
    parser.add_argument('-f', '--pcap-filter', help='pcap    filter    to    apply    (when    supported)')
    parser.add_argument('-C', '--no-cleanup', help='avoid    port    cleanup    heuristics', action='store_true')
    args = parser.parse_args()
    if args.verbose:
        config.DEBUG = True
    query_cache = {}
    for fname in args.files:
        try:
            fileparser = PARSERS_CHOICE[args.type]
        except KeyError:
            with utils.open_file(fname) as fdesc:
                try:
                    fileparser = PARSERS_MAGIC[fdesc.read(4)]
                except KeyError:
                    utils.LOGGER.warning('Cannot    find    the    appropriate    parser    for    file    %r', fname)
                    continue
        bulk = db.flow.start_bulk_insert()
        with fileparser(fname, args.pcap_filter) as fdesc:
            for rec in fdesc:
                if (not rec):
                    continue
                linkattrs = ('proto',)
                accumulators = {}
                for (fields, sp_linkattrs, sp_accumulators) in FIELD_REQUEST_EXT:
                    if all(((field in rec) for field in fields)):
                        linkattrs = sp_linkattrs
                       ...