Python networkx库
1.有向图

    # 1.创建一个空的有向图G = nx.DiGraph()nodes = ['A','B','C','D']# 2.添加节点for node in nodes:G.add_node(node)# 3.添加边edges = [('A','B'),('B','C'),('C','D')]for edge in edges:G.add_edge(edge[0],edge[1])# 4.使用spring布局Cpos = nx.spring_layout(G)# 5.绘制图nx.draw(G,pos,with_labels=True,node_color='skyblue',node_size=700,edge_color='k',linewidths=2,font_weight='bold',arrows=True)# 6.显示图plt.show()

2.无向图

    # 1.创建一个空的有向图G = nx.Graph()nodes = ['A','B','C','D']# 2.添加节点for node in nodes:G.add_node(node)# 3.添加边edges = [('A','B'),('B','C'),('C','D')]for edge in edges:G.add_edge(edge[0],edge[1])# 4.使用spring布局Cpos = nx.spring_layout(G)# 5.绘制图nx.draw(G,pos,with_labels=True,node_color='skyblue',node_size=700,edge_color='k',linewidths=2,font_weight='bold',arrows=True)# 6.显示图plt.show()