jupyter notebook切换kernel

确保安装了ipykernel

python3 -m pip install ipykernel
python3 -m ipykernel install --user

然后切换到目标环境，若没有先建立

conda create -n py36-test python=3.6
source activate py36-test
python -m ipykernel install --name py36-test //关键
source deactivate