Networkx 问题：需要安装 Graphviz / Pygraphviz (Anaconda 2021.11, WIN10x64)

Question

我正在使用 Jupyter Notebook 进行图表分析。我需要使用 Networkx 来生成 MultiDiGraph，我需要将它绘制成一棵树，但是出现了一个错误：

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/

所以我按照中的说明进行操作，但我仍然遇到同样的错误。也许我需要做一些其他事情来将 Pygraphviz 添加到我的 Anaconda 环境中，这样我就可以使用 networkx pygraphviz layouts.

关于正确执行此操作的任何建议？

我有 Graphviz 2.5 二进制文件，环境变量路径填充了 bin 的路径，所以我现在可以执行上面链接的问题中显示的示例。但是我感兴趣的代码需要 Pygraphviz，所以我觉得我是掌握网络的第 1/N 步。

Answer 1

您安装了错误的 graphviz 包装器，即 python-graphviz, but you need pyGraphviz:

conda install -c conda-forge pygraphviz

Networkx 问题：需要安装 Graphviz / Pygraphviz (Anaconda 2021.11, WIN10x64)

Networkx issue : need to install Graphviz / Pygraphviz (Anaconda 2021.11, WIN10x64)

python-3.x

anaconda

networkx

graphviz

pygraphviz