<｜begin▁of▁sentence｜>### Instruction:
Given two graphs G with node set {0} having an attribute 'a1' set to True, and H with node set {'a'} having an attribute 'a2' set to 'Spam', how do you compute and list the nodes and edges of the Cartesian product of G and H using NetworkX?
### Response:
import networkx as nx

# Create two simple graphs G and H
G = nx.Graph()
H = nx.Graph()

# Adding nodes with an attribute to the graph G
G.add_node(0, a1=True)

# Adding nodes with an attribute to the graph H
H.add_node('a', a2='Spam')

# Compute the Cartesian product of G and H
P = nx.cartesian_product(G, H)

# List the nodes of the Cartesian product graph P
print(list(P))

# List the edges of the Cartesian product graph P (if there were any edges in G and H)
print(list(P.edges()))
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