如何在networkx中从现有的图中创建一个随机图？

import networkx as nx

# 创建一个有向图
G = nx.DiGraph()

# 添加节点
G.add_nodes_from([1, 2, 3, 4, 5])

# 添加边
G.add_edges_from([(1, 2), (2, 3), (3, 4), (4, 5), (5, 1)])

# 从现有图中创建一个随机图
random_graph = nx.gnm_random_graph(G.number_of_nodes(), G.number_of_edges())

# 打印随机图的节点和边
print("随机图的节点：", random_graph.nodes())
print("随机图的边：", random_graph.edges())