Jupyter Notebook：kernel error 解决

Jupyter Notebook出现kernel error
当时用Anaconda安装多个版本的Python的时候，时常由于安装和卸载多次Python导致Juoyter notebook不可用。常常导致如下结果

File”//anaconda/lib/python2.7/site-packages/jupyter_client/manager.py”, line 190, in _launch_kernel 
return launch_kernel(kernel_cmd, **kw) 
File “//anaconda/lib/python2.7/site-packages/jupyter_client/launcher.py”, line 123, in launch_kernel 
proc = Popen(cmd, **kwargs) 
File “//anaconda/lib/python2.7/subprocess.py”, line 710, in init 
errread, errwrite) 
File “//anaconda/lib/python2.7/subprocess.py”, line 1335, in _execute_child 
raise child_exception 
OSError: [Errno 2] No such file or director

解决办法

• 运行python -m ipykernel install --user重新安装内核
• 如果有多个内核，先运行conda create -n python2 python=2，为Python2.7设置Anaconda变量，在Anacoda下使用activate pyhton2切换python环境
• 重启jupyter notebook即可

小技巧

jupyter kernelspec list 查看安装的内核和位置
进入安装内核目录打开kernel.jason文件，查看Python编译器的路径