怎么才能利用python生成下图的网络，也就是BA无标度网络，我自己试过生成的都不是样子

import networkx as nx
import matploylib.pyplot as plt
BA = nx.random_graphs.barabasi_albert_graph(30,1)
pos = nx.spring_layout(BA)

draw the BA graph

plt.suptitle('BA scale-free degree network')
nx.draw(BA,pos,with_labels = True,node_size = 180,font_size = 19)
plt.show()

我也是正在学，试试这个，我没试过，看见了，随便写下