AttributeError：“ DiGraph”对象没有属性“ number_of_selfloops”

如何解决AttributeError：“ DiGraph”对象没有属性“ number_of_selfloops”

我正在尝试通过jupyter笔记本在我的PC中运行图形绘图代码。我的电脑中安装了Networkx，pygraphviz和nxpd。但是运行后我发现AttributeError

绘制（G，layout =“ circo”）

如何解决此问题？错误在以下描述中：

AttributeError                            Traceback (most recent call last)
<ipython-input-2-d4524714330e> in <module>
----> 1 draw(G,layout='circo')

~/anaconda3/lib/python3.7/site-packages/nxpd/nx_pydot.py in draw_pydot(G,filename,format,prefix,suffix,layout,args,show)
    455 
    456     # Draw the image.
--> 457     G2 = to_pydot(G)
    458     G2.write(fobj,prog=prog,format=ext)
    459     if close:

~/anaconda3/lib/python3.7/site-packages/nxpd/nx_pydot.py in to_pydot(G,raise_exceptions)
    247         graph_type = 'graph'
    248 
--> 249     strict = G.number_of_selfloops() == 0 and not G.is_multigraph()
    250 
    251     # Create the Pydot graph.

AttributeError: 'DiGraph' object has no attribute 'number_of_selfloops'

代码如下：

import networkx as nx
import pygraphviz as pgv
from nxpd import draw,nxpdParams
nxpdParams['show'] = 'ipynb'
G = nx.DiGraph()


G.add_edge("a","b")
G.add_edge("b","c")
G.add_edge("c","d")
G.add_edge("d","e")
G.add_edge("e","c")
G.add_edge("a","d")
draw(G,layout='circo')

解决方法

软件包nxpd好像是最近几年更新的。您可以自己修改行（请参见https://github.com/chebee7i/nxpd/blob/master/nxpd/nx_pydot.py#L249），并与G.number_of_selfloops交换nx.number_of_selfloops(G)。但是，我认为它们与nxpd有关的问题更多，我建议您仅将networkx自己的接口用于graphviz，例如graphviz_layout：

pos = nx.nx_agraph.graphviz_layout(G,prog="circo")
nx.draw(G,pos)