gistfile1.txt

def total_edge_weight(D):
        total = 0
        for edge in D.edges(data=True):
                total += edge[2]["weight"]
        return total

def average_tie_strength(D):
        return float(total_edge_weight(D))/len(D.edges())

D = nx.DiGraph()
D.add_nodes_from([1,2])
D.add_edges_from([(1,2)])
D[1][2]["weight"] = 3

total_edge_weight(D)
3

average_tie_strength(D)
3.0