print "Number of nodes of gr1 : ", NB_NODES(gr1) n0 = NODE(gr1, 0) print "Number of edges of node 0 : ", NB_EDGES(n0) n3 = NODE(gr1, 3) print "Number of edges of node 3 : ", NB_EDGES(n3) if (EDGE(n0,2) == EDGE(n3,0)): print "Edge 2 at node n0 and edge 0 at node n3 are the same"