问题描述：
出现('Failed to import pydot. You must pip install pydot and install graphviz (https://graphviz.gitlab.io/download/), ', ‘for pydotprint to work.’)问题，如何解决，三步搞定，亲测有效！
解决方案：
1、pip install pydot
pip install graphviz
pip install pydot-ng
2、按照此链接https://graphviz.gitlab.io/download/#windows
下载
2.47.1 EXE installer for Windows 10 (64-bit): stable_windows_10_cmake_Release_x64_graphviz-install-2.47.1-win64.exe
3、安装添加环境变量
搞定！
参考：https://blog.csdn.net/qq_26822029/article/details/101000868
