jupyter notebook打不开:AttributeError: type object ‘IOLoop‘ has no attribute ‘initialized‘

我用的是Python3.6
创建虚拟环境后直接安装的jupyter:

conda install jupyter

然后在navigator界面打不开jupyter notebook,只能用命令打开
解决办法:降低tornado版本:

conda uninstall tornado
conda install tornado==4.4.3

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