code: def get_hosts_for_site(site=None):
      
      site = site or env.SITE
      hosts = set()
      for hostname, _sites in six.iteritems(env.available_sites_by_host):
  #         print('checking hostname:',hostname, _sites)
          for _site in _sites:
              if _site == site:
  #                 print( '_site:',_site)
                  host_ip = get_host_ip(hostname)
  #                 print( 'host_ip:',host_ip)
                  if host_ip:
                      hosts.add(host_ip)
                      break
      return list(hosts)
docs: Returns a list of hosts that have been configured to support the given site.