感谢stackoverflow,原问题网站https://stackoverflow.com/questions/35064304/runtimeerror-make-sure-the-graphviz-executables-are-on-your-systems-path-aft
解决方法:
您应该在系统中安装graphviz包(而不仅仅是python包)。在Ubuntu你应该试试:
sudo apt-get install graphvizNote: Windows also applies
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