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

在用python可視化.dot文件時，遇到了ExecutableNotFound: failed to execute [‘dot’, ‘-Tsvg’], make sure the Graphviz executables are on your systems的報錯。起初以爲原因是未安裝graphviz模塊，pip一下發現還是不行，後來才發現需要先安裝graphviz程序，才能爲python安

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