生成图片太小，不能看清节点间连线，太过密集，望能给出解决方法
# _*_ coding:utf-8 _*_
import matplotlib.pyplot as plt
import networkx as nx
G = nx.DiGraph()
#加载文件中边的关系
with open('bigdata.txt') as f:
lines = f.readlines()
mylist = [line.strip().split() for line in lines]
pos =nx.spring_layout(G)
outlist = []
for i in range(len(mylist)):
a = mylist[i][0]
for j in range(len(mylist[i])-1):
outlist.append([a, mylist[i][j+1]])
#加载边
G.add_edges_from(outlist)
nx.draw(G, with_labels=True, node_size=200,width=0.3, node_color='r', alpha = 0.7, edge_color='black',edge_vmin=2,edge_vmax=3)
plt.savefig('test1.png')
plt.show()
