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ImportError: cannot import name 'ensure_dir_exists'


   解决办法:升级jupyter_core和jupyter_client

pip install --upgrade jupyter_core jupyter_client

 在升级过程中留心可能出现的警告 

    升级后可能会出现valueerror: signal only works in main thread,原因是包版本冲突了

   >解决办法:

pip show pyzmq ipykernel
#pyzmq==18.0.0对应ipykernel==5.
pip install --upgrade ipykernel

 

error

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