code: def bootstrappable_neighbors(self):
          
          neighbors = self.protocol.router.find_neighbors(self.node)
          return [tuple(n)[-2:] for n in neighbors]
docs: Get a :class:`list` of (ip, port) :class:`tuple` pairs suitable for
          use as an argument to the bootstrap method.
  
          The server should have been bootstrapped
          already - this is just a utility for getting some neighbors and then
          storing them if this server is going down for a while.  When it comes
          back up, the list of nodes can be used to bootstrap.