Return the lexicographic product of G and H.
The lexicographical product P of the graphs G and H has a node set that is the Cartesian product of the node sets, $V(P)=V(G) imes V(H)$. P has an edge ((u,v),(x,y)) if and only if (u,v) is an edge in G or u==v and (x,y) is an edge in H.
Parameters: H (G,) – Networkx graphs. Returns: P – The Cartesian product of G and H. P will be a multi-graph if either G or H is a multi-graph. Will be a directed if G and H are directed, and undirected if G and H are undirected. Return type: NetworkX graph Raises:
NetworkXError– If G and H are not both directed or both undirected.
Node attributes in P are two-tuple of the G and H node attributes. Missing attributes are assigned None.
>>> G = nx.Graph() >>> H = nx.Graph() >>> G.add_node(0,a1=True) >>> H.add_node('a',a2='Spam') >>> P = nx.lexicographic_product(G,H) >>> P.nodes() [(0, 'a')]
Edge attributes and edge keys (for multigraphs) are also copied to the new product graph