G.addEdge(source, target, weight)
elif command == '9':
source = int(input("source: "))
target = int(input("target: "))
G.removeEdge(source, target)
elif command == '10':
source = int(input("source: "))
target = int(input("target: "))
print(G.Dijkstra(source)[target])
elif command == '11':
components = G.connectedComponents()
for comp in components:
print(comp)
print("There are %i connected components." % len(components))
elif command == '12':
components = G.scc()
for comp in components:
print(comp)
print("There are %i strongly connected components." % len(components))
elif command == '0':
exit(0)
else:
print("bad command.")
command = input("> ")
showMenu()
# components = G.scc()
#print(data['discovery'])
#print(data['finish'])
