code: def __get_known_node_by_host(self, hostname):
          '''
          Determine if the node is already known by hostname.
          If it is, return it.
          '''
          for n in self.nodes:
              if (n.name == hostname):
                  return n
          return Nonf __get_known_node_by_host(self, hostname):
          '''
          Determine if the node is already known by hostname.
          If it is, return it.
          '''
          for n in self.nodes:
              if (n.name == hostname):
                  return n
          return None
docs: Determine if the node is already known by hostname.
          If it is, return it.