jupyter notebook :ImportError: cannot import name 'constants' 解决方案

• 如果运行jupyter notebook 出现如下错误：

  File "B:\ProgramData\Anaconda3\lib\site-packages\zmq\backend\cython\__init__.py", line 6, in <module>
    from . import (constants, error, message, context,
ImportError: cannot import name 'constants'

• 一种有效的解决方案是：

    Try uninstalling and reinstalling pyzmq.

• 参考： https://github.com/jupyter/notebook/issues/636