'Return a dict of neighbors of node n in the dense graph.
Parameters
n : node
A node in the graph.
Returns
adj_dict : dictionary
The adjacency dictionary for nodes connected to n.'

def __getitem__(self, n):

    return dict(((node, self.all_edge_dict) for node in ((set(self.adj) - set(self.adj[n])) - set([n]))))
