graphviz已经下载好,并写入环境变量中,仍然提示有错误

graphviz已经下载好,并写入环境变量中,而且也已经输入pip install graphviz ,pip install pydot ,仍然报错:

`pydot` failed to call GraphViz.Please install GraphViz (https://www.graphvi.org)... 

修正方法:不要用pip install graphviz 用conda install graphviz即可解决

#在anaconda prompt中依次输入:
pip uninstall graphviz
conda install graphviz

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