我Jupyter Notebook用來做圖形分析。我需要用來Networkx生成 MultiDiGraph，我需要將其繪制為樹，但出現錯誤：
from networkx.drawing.nx_agraph import write_dot, graphviz_layout
write_dot(G,'test.dot')
plt.title('draw_networkx')
pos =graphviz_layout(G, prog='dot')
nx.draw(G, pos, with_labels=False, arrows=True)
ModuleNotFoundError Traceback (most recent call last)
D:\Programmes\Anaconda3\lib\site-packages\networkx\drawing\nx_agraph.py in to_agraph(N)
131 try:
--> 132 import pygraphviz
133 except ImportError as e:
ModuleNotFoundError: No module named 'pygraphviz'
The above exception was the direct cause of the following exception:
ImportError Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_33384/3939344011.py in <module>
----> 1 write_dot(G,'test.dot')
2 plt.title('draw_networkx')
3 pos =graphviz_layout(G, prog='dot')
4 nx.draw(G, pos, with_labels=False, arrows=True)
D:\Programmes\Anaconda3\lib\site-packages\networkx\drawing\nx_agraph.py in write_dot(G, path)
183 Filename or file handle to write
184 """
--> 185 A = to_agraph(G)
186 A.write(path)
187 A.clear()
D:\Programmes\Anaconda3\lib\site-packages\networkx\drawing\nx_agraph.py in to_agraph(N)
132 import pygraphviz
133 except ImportError as e:
--> 134 raise ImportError("requires pygraphviz " "http://pygraphviz.github.io/") from e
135 directed = N.is_directed()
136 strict = nx.number_of_selfloops(N) == 0 and not N.is_multigraph()
ImportError: requires pygraphviz http://pygraphviz.github.io/
所以我按照這個問題中的說明進行操作，但我仍然遇到同樣的錯誤。也許我需要做一些其他事情來添加Pygraphviz到我的 Anaconda 環境中，所以我可以使用networkx pygraphviz layouts.
有關正確執行此操作的任何建議嗎？
我有 Graphviz 2.5 二進制檔案，環境變數路徑填充了 bin 的路徑，所以我現在可以執行上面鏈接的問題中顯示的示例。但是我感興趣的代碼是必要的Pygraphviz，所以我覺得我在掌握我的網路的道路上邁出了第一步。
uj5u.com熱心網友回復：
您安裝了錯誤的graphviz包裝器，即python-graphviz，但您需要pyGraphviz：
conda install -c conda-forge pygraphviz
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