創建圖表類

Question

如何繪製稱爲流圖的新類。我得到了很多的錯誤：

Traceback (most recent call last): 
    File "Graphs.py", line 26, in <module> 
    nx.draw(F1) 
    File "/home/thinkpad/anaconda3/lib/python3.4/site-packages/networkx/drawing/nx_pylab.py", line 131, in draw 
    draw_networkx(G, pos=pos, ax=ax, **kwds) 
    File "/home/thinkpad/anaconda3/lib/python3.4/site-packages/networkx/drawing/nx_pylab.py", line 262, in draw_networkx 
    pos = nx.drawing.spring_layout(G) # default to spring layout 
    File "/home/thinkpad/anaconda3/lib/python3.4/site-packages/networkx/drawing/layout.py", line 232, in fruchterman_reingold_layout 
    if len(G)==0: 
TypeError: object of type 'FlowGraph' has no len() 

代碼：

import networkx as nx 
import matplotlib.pyplot as plt 

class FlowGraph: 
    G=nx.DiGraph() 
    I=[] 
    O=[] 

F1=FlowGraph() 
# Add nodes 
F1.G.add_node(1) 
F1.G.add_node(2) 
F1.G.add_node(3) 
# Add edges 
F1.G.add_edge(1,2) 
#F1.G.add_edges_from[(1,2),(2,3)] 
# Add interface 
F1.I=[1] 
F1.O=[3] 
nx.draw(F1) 
plt.show() 

Answer 1

回溯告訴你，功能nx.draw失敗。如果您查看nx.draw的文檔字符串，您會看到它預計networkx圖作爲第一個參數。相反，您提供了一個FlowGraph實例。功能nx.draw根本不知道如何處理FlowGraph。

也許你想傳遞F1.G爲nx.draw？請注意0​​是網絡x圖。