if command == '1':
print("There are %i vertices." % G.numberOfVertices())
elif command == '2':
source = int(input("source: "))
target = int(input("target: "))
G.isEdge(source, target)
"""
if G.isEdge(source, target):
print("Edge exists.")
else:
print("Edge doesn't exist.")
"""
elif command == '3':
x = int(input("vertex: "))
print("inDegree: %i" % G.inDegree(x))
print("outDegree: %i" % G.outDegree(x))
elif command == '4':
x = int(input("vertex: "))
print("out edges: %s" % ', '.join([str(y[0]) for y in G.outboundEdges(x)]))
elif command == '5':
x = int(input("vertex: "))
print("in edges: %s" % ', '.join([str(y[0]) for y in G.inboundEdges(x)]))
elif command == '6':
x = int(input("vertex: "))
G.addNode(x)
elif command == '7':
x = int(input("vertex: "))
G.removeVertex(x)
elif command == '8':
source = int(input("source: "))
