jupyter notebook 设定指定conda环境

对于新用户而言，不清楚如何配置 jupyter notebook 的环境

在 jupyter notebook 切换 conda 环境

1、添加环境

下面演示如何添加环境：

（1）安装相关库

conda install ipykernel

例如：

(python36) gs@aigo:~$ conda install ipykernel

（2）安装环境：

python -m ipykernel install --user --name 环境名称 --display-name "jupyter的环境名称"

例如：

(python36) gs@aigo:~$ conda env list
# conda environments:
#
base                     /home/gs/anaconda3
gluon                    /home/gs/anaconda3/envs/gluon
python36              *  /home/gs/anaconda3/envs/python36
pytorch                  /home/gs/anaconda3/envs/pytorch

(python36) gs@aigo:~$
(python36) gs@aigo:~$ python -m ipykernel install --user --name python36 --display-name "python36"
Installed kernelspec python36 in /home/gs/.local/share/jupyter/kernels/python36
(python36) gs@aigo:~$ 

（3）最后打开jupyter，就可以看到刚刚添加的conda环境了

(python36) gs@aigo:~$ jupyter notebook

2、查看环境

(python36) gs@aigo:~/.local/share/jupyter/kernels$ jupyter kernelspec list
Available kernels:
  gluon         /home/gs/.local/share/jupyter/kernels/gluon
  python36      /home/gs/.local/share/jupyter/kernels/python36
  python3_tf    /home/gs/.local/share/jupyter/kernels/python3_tf
  pytorch       /home/gs/.local/share/jupyter/kernels/pytorch
  python3       /home/gs/anaconda3/envs/python36/share/jupyter/kernels/python3
(python36) gs@aigo:~/.local/share/jupyter/kernels$ 

2、修改环境

从上面的日志可以知道，安装的目录为：

(python36) gs@aigo:~/.local/share/jupyter/kernels$ ls
gluon  python3  python36  python3_tf  pytorch

如果要修改某个配置，或者是修改名字，可以直接修改对应的文件即可，例如：

(python36) gs@aigo:~/.local/share/jupyter/kernels/python36$ cat kernel.json 
{
 "argv": [
  "/home/gs/anaconda3/envs/python36/bin/python",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "python36",
 "language": "python"
}
(python36) gs@aigo:~/.local/share/jupyter/kernels/python36$

3、删除环境

比如删除python3，如下：

(python36) gs@aigo:~/.local/share/jupyter$ jupyter kernelspec remove python3
Kernel specs to remove:
  python3             	/home/gs/.local/share/jupyter/kernels/python3
Remove 1 kernel specs [y/N]: y
[RemoveKernelSpec] Removed /home/gs/.local/share/jupyter/kernels/python3

查看：

(python36) gs@aigo:~/.local/share/jupyter$ jupyter kernelspec list
Available kernels:
  python3       /home/gs/.local/lib/python3.6/site-packages/ipykernel/resources
  gluon         /home/gs/.local/share/jupyter/kernels/gluon
  python36      /home/gs/.local/share/jupyter/kernels/python36
  python3_tf    /home/gs/.local/share/jupyter/kernels/python3_tf
  pytorch       /home/gs/.local/share/jupyter/kernels/pytorch
(python36) gs@aigo:~/.local/share/jupyter$

还是有python3，好像没有删除掉，重新打开 jupyter notebook；

在 jupyter notebook 上还能看见python3，这是因为默认会显示，

需要在 jupyter notebook 的配置文件中，添加下面的这句：

c.KernelSpecManager.ensure_native_kernel = False

jupyter notebook 的配置文件，在如下：

gs@aigo:~/.jupyter$ ls
jupyter_notebook_config.py  lab  migrated  nbconfig

最后，再打开  jupyter notebook，python3不见了，完美！

如果没有 jupyter_notebook_config.py 文件，就使用下面的命令生成一个：

$ jupyter notebook --generate-config