Installing wrong kernel_json

[John L. Ries]

In my kernel, based on ProcessMetaKernel, I define...

  language_info = {'name': 'SPM',
                   'codemirror_mode': 'shell',
                   'mimetype': 'text/plain',
                   'file_extension': '.cmd'}
  kernel_json = {"argv": ["python3", "-m", "spm_kernel",
                          "-f", "{connection_file}"],
                 "display_name": "SPM",
                 "language": "SPM"}

To install my kernel into Jupyter, I run:

python3 -m spm_kernel install --user

But instead of getting the expected kernelspec (SPM), I get:

Installed kernelspec python3 in /home/jries/.local/share/jupyter/kernels/python3

/home/jries/.local/share/jupyter/kernels/python3/kernel.json reads as follows:

{
 "argv": [
  "/usr/bin/python3",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3",
 "language": "python"

...which is not at all what we want. I assume that that kernel.json is the default, but how do I override it?

For your diagnosing pleasure, I have put spm_kernel on GitHub (https://github.com/jlries61/spm_kernel). The file in question is spm_kernel/kernel.py.

Any assistance you could provide would be greatly appreciated.

[Steven Silvester]

Found it! Your __main__.py should use your own kernel class.

[John L. Ries]

I had to change things a little more than that, but...
My copy of __main__.py now reads:

from .kernel import SPMKernel
if __name__ == "__main__":
  SPMKernel.run_as_main()

...matching what I see for various other kernels.

And I also corrected the definition of kernel_json by adding the "name" attribute, as follows:

kernel_json = {"argv": ["python3", "-m", "spm_kernel",
                          "-f", "{connection_file}"],
                 "display_name": "SPM",
                 "language": "SPM",
                 "name": "SPM"}

Thanks to Steve for the clue.