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

    """The main tcollector entry point and loop.
    """
    try:
        (options, args) = parse_cmdline(argv)
    except:
        sys.stderr.write(('Unexpected    error:    %s' % sys.exc_info()[0]))
        return 1
    if options.daemonize:
        daemonize()
    setup_logging(options.logfile, (options.max_bytes or None), (options.backup_count or None))
    if options.verbose:
        LOG.setLevel(logging.DEBUG)
    if options.pidfile:
        write_pid(options.pidfile)
    tags = {}
    for tag in options.tags:
        if (re.match('^[-_.a-z0-9]+=\\S+$', tag, re.IGNORECASE) is None):
            assert False, ('Tag    string    "%s"    is    invalid.' % tag)
        (k, v) = tag.split('=', 1)
        if (k in tags):
            assert False, ('Tag    "%s"    already    declared.' % k)
        tags[k] = v
    if ((not ('host' in tags)) and (not options.stdin)):
        tags['host'] = socket.gethostname()
        LOG.warning('Tag    "host"    not    specified,    defaulting    to    %s.', tags['host'])
    options.cdir = os.path.realpath(options.cdir)
    if (not os.path.isdir(options.cdir)):
        LOG.fatal('No    such    directory:    %s', options.cdir)
        return 1
    modules = load_etc_dir(options, tags)
    setup_python_path(options.cdir)
    atexit.register(shutdown)
    for sig in (signal.SIGTERM, signal.SIGINT):
        signal.signal(sig, shutdown_signal)
    reader = ReaderThread(options.dedupinterval, options.evictinterval, options.deduponlyzero)
    reader.start()
    if (not options.hosts):
        options.hosts = [(options.host, options.port)]
    else:
        def splitHost(hostport):
            if (':' in hostport):
                if ((hostport[0] == '[') and (']:' in hostport)):
                    (host, port) = hostport.split(']:')
                    host = host[1:]
                else:
                    (host, port) = hostport.split(':')
                return (host, int(port))
            return (hostport, DEFAULT_PORT)
        options.hosts = [splitHost(host) for host in options.hosts.split(',')]
        if ((options.host !=...