通过plt.subplot能够在一张图中画出多个子图

#coding: utf-8#!/usr/bin/env python"""Draw a graph with matplotlib.You must have matplotlib for this to work."""__author__ = """Aric Hagberg (hagberg@lanl.gov)"""#    Copyright (C) 2004-2008#    Aric Hagberg 
     
      #    Dan Schult 
      
       #    Pieter Swart 
       
        #    All rights reserved.#    BSD license.#raise的使用要求这一步必须运行try:    import matplotlib.pyplot as pltexcept:    raiseimport networkx as nx#用grid_2d_graph()生成一个16个节点的网格图G=nx.grid_2d_graph(4,4)  #4x4 gridpos=nx.spring_layout(G,iterations=100)#開始画各个小图plt.subplot(221)nx.draw(G,pos,font_size=8)plt.subplot(222)nx.draw(G,pos,node_color='k',node_size=0,with_labels=False)plt.subplot(223)nx.draw(G,pos,node_color='g',node_size=250,with_labels=False,width=6)#最后一幅子图转为有向图plt.subplot(224)H=G.to_directed()nx.draw(H,pos,node_color='b',node_size=20,with_labels=False)plt.savefig("four_grids.png")plt.show()