code: def _maybe_unique_host(onion):
      
      hosts = [
          onion.get_client(nm).hostname
          for nm in onion.client_names()
      ]
      if not hosts:
          raise ValueError(
              "Can't access .onion_uri because there are no clients"
          )
      host = hosts[0]
      for h in hosts[1:]:
          if h != host:
              raise ValueError(
                  "Cannot access .onion_uri for stealth-authenticated services "
                  "because each client has a unique URI"
              )
      return host
docs: :param onion: IAuthenticatedOnionClients provider
  
      :returns: a .onion hostname if all clients have the same name or
          raises ValueError otherwise