使用pydot绘制图形时断言错误

Question

我刚开始使用 pydot 创建图表。我刚刚创建了一个节点，但在尝试使用 jupyter notebook 显示图形时遇到了问题。这是我的代码：

import pydot
import os
from IPython.display import Image, display
G= pydot.Dot(graph_type='digraph')
node = pydot.Node("S'->.S\nS->.(L)/.a")
G.add_node(node)
im = Image(G.create_png())
display(im)

下面是我的错误

"dot" with args ['-Tpng', 'C:\Users\MAYANK~1\AppData\Local\Temp\tmptw6hrboj'] returned code: 1

stdout, stderr:
 b''
b"'C:\Users\Mayank' is not recognized as an internal or external command,\r\noperable program or batch file.\r\n"

---------------------------------------------------------------------------
AssertionError                            Traceback (most recent call last)
<ipython-input-10-fb336e9303b4> in <module>
      5 node = pydot.Node("S'->.S\nS->.(L)/.a")
      6 G.add_node(node)
----> 7 im = Image(G.create_png())
      8 display(im)

~\anaconda3\lib\site-packages\pydot.py in new_method(f, prog, encoding)
   1721                 """Refer to docstring of method `create`."""
   1722                 return self.create(
-> 1723                     format=f, prog=prog, encoding=encoding)
   1724             name = 'create_{fmt}'.format(fmt=frmt)
   1725             self.__setattr__(name, new_method)

~\anaconda3\lib\site-packages\pydot.py in create(self, prog, format, encoding)
   1943             print(message)
   1944 
-> 1945         assert process.returncode == 0, process.returncode
   1946 
   1947         return stdout_data

AssertionError: 1

请帮我清除这个错误!!

Answer 1

因为名声我不能评论，但我可以说当

pos = graphviz_layout(temp_nx, prog="dot")

给我一个断言错误，

pos = nx.nx_agraph.pygraphviz_layout(temp_nx, prog='dot')

工作

Answer 2

我可以使用 nx.DiGraph 而不是 nx.Graph

来解决这个问题

import networkx as nx
from networkx.drawing.nx_pydot import graphviz_layout

G = nx.DiGraph()
# add stuff to graph
fig = plt.figure()
pos = graphviz_layout(self.tree, prog='dot')
nx.draw_networkx_nodes(self.tree, pos)
nx.draw_networkx_edges(self.tree, pos)
plt.show()

使用pydot绘制图形时断言错误

Assertion error while drawing graph with pydot

python

python-3.x

graphviz

assertion

pydot