修改jupyter-notebook的python3版本

将默认的kernel修改为对应的python即可:

/home/a/.virtualenvs/YOUR_VENV/bin/python -m pip install ipykernel 
/home/a/.virtualenvs/YOUR_VENV/bin/python -m ipykernel install --user

转自https://www.zhihu.com/question/54042811