How to use the execo.host.Host function in execo

" new one")
                sys.exit(3)

    logger.info("Using id = " + str(hc_id))

    verbose = True
    if args.quiet:
        verbose = False

    # Check node specification
    node_host = None
    if args.node:
        if not (args.execute or args.jarjob):
            logger.warn("--node only applies to --execute or --jarjob")
        else:
            node_host = Host(args.node[0])

    # Create or load object
    hc_file_name = os.path.join(hg5k_tmp_dir, str(hc_id))
    if args.create:

        if os.path.exists(hc_file_name):
            logger.error("There is a hadoop cluster with that id. You must "
                         "remove it before or chose another id")
            sys.exit(1)

        hosts = __generate_hosts(args.create[0])
        
        if args.version:
            if args.version[0].startswith("0."):
                hadoop_class = HadoopCluster
            elif args.version[0].startswith("1."):

Args:
      hosts_input: The path of the file containing the hosts to be used,
        or a comma separated list of site:job_id or an a comma separated list
        of hosts or an oargrid_job_id.
        If a file is used, each host should be in a different line.
        Repeated hosts are pruned.
        Hint: in a running Grid5000 job, $OAR_NODEFILE should be used.

    Return:
      list of Host: The list of hosts.
    """
    hosts = []
    if os.path.isfile(hosts_input):
        for line in open(hosts_input):
            h = Host(line.rstrip())
            if h not in hosts:
                hosts.append(h)
    elif ':' in hosts_input:
        # We assume the string is a comma separated list of site:job_id
        for job in hosts_input.split(','):
            site, job_id = job.split(':')
            hosts += get_oar_job_nodes(int(job_id), site)
    elif "," in hosts_input:
        # We assume the string is a comma separated list of hosts
        for hstr in hosts_input.split(','):
            h = Host(hstr.rstrip())
            if h not in hosts:
                hosts.append(h)
    elif hosts_input.isdigit():
        # If the file_name is a number, we assume this is a oargrid_job_id
        hosts = get_oargrid_job_nodes(int(hosts_input))

for job in hosts_input.split(','):
            site, job_id = job.split(':')
            hosts += get_oar_job_nodes(int(job_id), site)
    elif "," in hosts_input:
        # We assume the string is a comma separated list of hosts
        for hstr in hosts_input.split(','):
            h = Host(hstr.rstrip())
            if h not in hosts:
                hosts.append(h)
    elif hosts_input.isdigit():
        # If the file_name is a number, we assume this is a oargrid_job_id
        hosts = get_oargrid_job_nodes(int(hosts_input))
    else:
        # If not any of the previous, we assume is a single-host cluster where
        # the given input is the only host
        hosts = [Host(hosts_input.rstrip())]

    logger.debug('Hosts list: \n%s',
                 ' '.join(style.host(host.address.split('.')[0])
                          for host in hosts))
    return hosts

def __generate_hosts(file_name):
        """Generate a list of hosts from the given file.
        
        Args:
          file_name: The path of the file containing the hosts to be used. Each
            host should be in a different line. Repeated hosts are pruned.
            Hint: in Grid5000 $OAR_NODEFILE should be used.
        
        Return:
          list of Host: The list of hosts.
        """

        hosts = []

        for line in open(file_name):
            h = Host(line.rstrip())
            if not h in hosts:
                hosts.append(h)

        return hosts