Return a list of all neighbors of the nodes in nbunch, including the nodes in nbunch.
- G : graph
- A NetworkX graph.
nbunch : a single node or iterable container
- neighbors : list
- A list containing all nodes that are a neighbor of some node in nbunch together with all nodes in nbunch.
>>> G = nx.path_graph(3) # Path on 3 nodes >>> nx.closed_neighborhood(G, 1) [0, 1, 2]