code: def add_node(self, node):
          
          if _debug: Network._debug("add_node %r", node)
  
          self.nodes.append(node)
          node.lan = self
  
          # update the node name
          if not node.name:
              node.name = '%s:%s' % (self.name, node.address)
docs: Add a node to this network, let the node know which network it's on.