解决failed to execute [‘dot’, ‘-Tsvg’], make sure the Graphviz executables are on your systems

在用python可视化.dot文件时，遇到了ExecutableNotFound: failed to execute [‘dot’, ‘-Tsvg’], make sure the Graphviz executables are on your systems的报错。起初以为原因是未安装graphviz模块，pip一下发现还是不行，后来才发现需要先安装graphviz程序，才能为python安

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