failed to execute ['dot', '-Tsvg'], make sure the Graphviz executables are on your systems' PATH

问题描述： 安装graphviz之后，使用时出现如下错误 failed to execute ['dot', '-Tsvg'], make sure the Graphviz executables are on your systems' PATH 解决方法： 1. 下载并安装graphviz https://graphviz.gitlab.io/_pages/Download/Download

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