networkx创建带权有向图，访问每个点的邻居节点(neighbor)和边权(weight)

import networkx as nx 

G = nx.DiGraph() # 创建有向图

G.add_edge(1, 2, weight=1)  # 添加 带权边，weight表示边权
G.add_edge(1, 3, weight=1)
G.add_edge(3, 1, weight=1)
G.add_edge(2, 4, weight=1)

print(G[1]) # 邻居的dict
for nbr, value in G.adj[1].items(): # 枚举邻居
    print(nbr, value, value['weight'])
print('*' * 20)

for nbr, value in G[2].items(): # 枚举邻居，G[2]与G.adj[2]效果相同
    print(nbr, value, value['weight'])

参考¹²