`pydot` failed to call GraphViz.Please install GraphViz

Solution:

conda install python-graphviz

conda install pydot-ng pydot

，pydot-ng 没有不要也可以。

if not work

also do:

1 . Download and install graphviz-2.38.msi from
https://graphviz.gitlab.io/_pages/Download/Download_windows.html

Double-click to install graphviz-2.38.msi using default path

2 . Set the path variable
(a) Control Panel > System and Security > System > Advanced System Settings > Environment Variables > Path > Edit
(b) add 'C:\Program Files (x86)\Graphviz2.38\bin'

3. Restart python coding environment

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