How to disable ipykernel / configure it?

[doronbehar]

I'd like to configure a jupyter environment and I'd like it to present only a single python Notebook in the launcher. Currently, if I use:

devShell = (jupyterlabWith {
  kernels = [];
}).env

I still see ipykernel in the launcher:

And if I use:

devShell = (jupyterlabWith {
  kernels = [
    (kernels.iPythonWith {
      name = "python";
      packages = p: [p.pint];
    })
  ];
}).env

I get another python launcher:

And I noticed that the python module pint is not available in the ipykernel notebook, but it is available in the right launcher.

How do I disable the ipykernel launcher?

[GTrunSec]

looks like the the ipykernel was wrapped by jupyterlab.

jupyter kernelspec list
Available kernels:
  python3      /nix/store/n2sxhzm1d38r9p2lgj6ww7b84bl81y53-python3.8-ipykernel-5.5.0/lib/python3.8/site-packages/ipykernel/resources

• Reproduced command

nix-shell -p 'python3.withPackages(ps : with ps; [ jupyterlab ])' --command 'jupyter kernelspec list


nix-shell -p 'jupyter' --command 'jupyter kernelspec list'
Available kernels:
  python3    /nix/store/pckir9hzqqzsark8vbwh3rzig8qg74z0-python3.9-ipykernel-6.4.1/lib/python3.9/site-packages/ipykernel/resources
Available kernels:

[doronbehar]

looks like the the ipykernel was wrapped by jupyterlab.

I also noticed that, and I can't trace where this launcher is defined.

[GTrunSec]

please try:

jupyter lab --KernelSpecManager.ensure_native_kernel=False

[guaraqe]

The first time I tried removing this kernel, I failed, but this is something I would like for some time. Like 1/3 of the issue reports are about Python packages not working because people clicked on the wrong kernel.

@GTrunSec Is this a new flag? If this works, we could add it by default.

[GTrunSec]

Is this a new flag? If this works, we could add it by default.

Sure, It works. you can find all of the settings in the config file of jupyter. which means you can do either flag or put it in the config file(~/.jupyter/jupyter_notebook_config.py )

[doronbehar]

The first time I tried removing this kernel, I failed, but this is something I would like for some time. Like 1/3 of the issue reports are about Python packages not working because people clicked on the wrong kernel.

I think this is a Nixpkgs issue. I also failed to trace the source of this kernel there but perhaps that's possible with some effort. @FRidh since you maintain some of jupyter's related packages in Nixpkgs perhaps you could help here please?