彻底解决运行jupyer notebook错误：ImportError: cannot import name 'constants'、ValueError: signal only works in main thread、ERROR:tornado.application:Exception in callback

彻底解决运行jupyer notebook错误：ImportError: cannot import name 'constants'、ValueError: signal only works in main thread、ERROR:tornado.application:Exception in callback

pip install --upgrade pyzmq==17.0.0 --ignore-installed pyzmq

pip install tornado==4.5.3

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原文地址：https://www.cnblogs.com/zhengbiqing/p/12605444.html