有人可以告诉我为什么我没有可以选择 python3 作为内核吗？

# python3 -m ipykernel install --user
Installed kernelspec python3 in /root/.local/share/jupyter/kernels/python3

# python3 -m pip install ipykernel
Requirement already satisfied: ipykernel in /usr/lib/python3.4/site-packages
Requirement already satisfied: tornado>=4.0 in /usr/lib64/python3.4/site-packages (from ipykernel)
Requirement already satisfied: ipython>=4.0.0 in /usr/lib/python3.4/site-packages (from ipykernel)
Requirement already satisfied: jupyter-client in /usr/lib/python3.4/site-packages (from ipykernel)
Requirement already satisfied: traitlets>=4.1.0 in /usr/lib/python3.4/site-packages (from ipykernel)
Requirement already satisfied: backports_abc>=0.4 in /usr/lib/python3.4/site-packages (from tornado>=4.0->ipykernel)
Requirement already satisfied: pexpect; sys_platform != "win32" in /usr/lib/python3.4/site-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: pickleshare in /usr/lib/python3.4/site-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: decorator in /usr/lib/python3.4/site-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: pygments in /usr/lib64/python3.4/site-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: setuptools>=18.5 in /usr/lib/python3.4/site-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: simplegeneric>0.8 in /usr/lib/python3.4/site-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: prompt-toolkit<2.0.0,>=1.0.3 in /usr/lib/python3.4/site-packages (from ipython>=4.0.0->ipykernel)
Requirement already satisfied: jupyter-core in /usr/lib/python3.4/site-packages (from jupyter-client->ipykernel)
Requirement already satisfied: pyzmq>=13 in /usr/lib64/python3.4/site-packages (from jupyter-client->ipykernel)
Requirement already satisfied: ipython-genutils in /usr/lib/python3.4/site-packages (from traitlets>=4.1.0->ipykernel)
Requirement already satisfied: six in /usr/lib/python3.4/site-packages (from traitlets>=4.1.0->ipykernel)
Requirement already satisfied: ptyprocess>=0.5 in /usr/lib/python3.4/site-packages (from pexpect; sys_platform != "win32"->ipython>=4.0.0->ipykernel)
Requirement already satisfied: wcwidth in /usr/lib/python3.4/site-packages (from prompt-toolkit<2.0.0,>=1.0.3->ipython>=4.0.0->ipykernel)

从命令行我可以看到确实安装了python3内核

# jupyter kernelspec list
[ListKernelSpecs] WARNING | Native kernel (python2) is not available
[ListKernelSpecs] WARNING | Native kernel (python2) is not available
Available kernels:
  python3    /root/.local/share/jupyter/kernels/python3

但是jupyter并不能理解它: 有人可以建议如何解决这个问题吗？

最佳答案

尝试:

python3 -m IPython kernelspec install-self 或

python3 -m jupyter kernelspec install-self

要重新安装内核规范， 我指的是这个issue

https://stackoverflow.com/questions/41923732/