Cannot add python3 kernel to Jupyter

Question

I wanted to change path of the kernel in Jupyter to set it to the one I'm using in the machine.

Here is the original kernels that were install in jupyter:

jupyter kernelspec list

Available kernels:
python3 /home/n/.local/share/jupyter/kernels/python3
python2 /usr/local/share/jupyter/kernels/python2

Then I checked the path of python3 in my machine like this:

which python3

/usr/bin/python3

$ ipython kernelspec list

I deleted the kernel of python3 like this:

jupyter kernelspec uninstall python3

which was successfully performed, then I tried to install python3 using the path I found earlier like this:

jupyter kernelspec install /usr/bin/python3

which gave me this error:

File "/usr/local/bin/jupyter-kernelspec", line 11, in sys.exit(KernelSpecApp.launch_instance())
File "/usr/local/lib/python2.7/dist-packages/traitlets/config/application.py", line 658, in launch_instance app.start()
File "/usr/local/lib/python2.7/dist-packages/jupyter_client/kernelspecapp.py", line 273, in start return self.subapp.start()
File "/usr/local/lib/python2.7/dist-packages/jupyter_client/kernelspecapp.py", line 143, in start replace=self.replace,
File "/usr/local/lib/python2.7/dist-packages/jupyter_client/kernelspec.py", line 299, in install_kernel_spec shutil.copytree(source_dir, destination)
File "/usr/lib/python2.7/shutil.py", line 171, in copytree

names = os.listdir(src) OSError: [Errno 20] Not a directory: '/usr/bin/python3'

Then I looked for the correct path like this:

python3 -c "import sys; print ('\n'.join(sys.path))"

/usr/lib/python3.4

/usr/lib/python3.4/plat-x86_64-linux-gnu

/usr/lib/python3.4/lib-dynload

/usr/local/lib/python3.4/dist-packages

/usr/local/lib/python3.4/dist-packages/setuptools-28.8.0-py3.4.egg

/usr/lib/python3/dist-packages

I tried to install it gain like this:

sudo jupyter kernelspec install /usr/lib/python3.4

[InstallKernelSpec] Installed kernelspec python3.4 in /usr/local/share/jupyter/kernels/python3.4

Now, when I start jupyter there is no Python 3 at all as a kernel, I'm not sure now what to do?

Answer 1

You probably haven't installed ipykernel on your python 3 install. To install a python kernel the proper steps are:

pip3 install ipykernel

python3 -m ipykernel install --user

See here