jupyter：没有可用的内核

Question

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)

从命令行我确实可以看到 python3 内核已安装

# 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？

Answer 1

尝试：

python3 -m IPython kernelspec install-self 或

python3 -m jupyter kernelspec install-self

重新安装内核规范，我指的是这个 issue

Answer 2

python3 -m jupyter kernelspec install-self

转到 Appdata/Roaming/Jupyter 中的 jupyter 文件夹然后在文件夹里面，你会发现里面有一个kernels文件夹，里面会有很多内核，比如python3 etc

路径应该是这样的，

C:\Users\Jayasurya\AppData\Roaming\jupyter\kernels\python3

在此找到一个 kernel.json 文件并确保您的 Python 可执行文件在文件

中

{
 "argv": [
  "c:\python\python.exe",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"
}

路径应该在 args 列表中，在我上面的代码中它在第 3 行 "c:\python\python.exe" 确保可执行路径是正确的

Answer 3

jupyter kernelspec install-self

自 4.0 起已弃用。

现在你必须使用

ipython kernel install

Answer 4

为了解决这个问题，我安装了 ipython 内核并且一切正常。

pip install ipython

jupyter：没有可用的内核

jupyter: no kernel available

ipython-notebook

jupyter

jupyter-notebook