nbbgrader on jupyterhub with LUA and OCaml Kernels

[Mad31]

Operating system

Ubuntu 22.04.2 LTS in a docker

nbgrader --version

• Python version 3.10.6
• nbgrader version 0.8.4

jupyterhub --version (if used with JupyterHub)

• 4.0.1

jupyter notebook --version

• 6.5.4

Expected behavior

Using grader with the OCaml Kernel

Actual behavior

All is working fine when i try to grade Notebook with Lua-Notebook (kernel https://github.com/guysv/ilua), but when i try to grade notebooks with OCalml Kernel (https://github.com/akabe/ocaml-jupyter) , i have an error :

File "/usr/local/lib/python3.10/dist-packages/nbgrader/preprocessors/execute.py", line 83, in on_cell_executed
        if output.output_type == 'error' and output.ename == reply["content"]["ename"]:
    KeyError: 'ename'

I have tried to edit execute.py and remove the second test and output.ename == reply["content"]["ename"], and now it's working fine..

Is this test important ?

remark1 :
this error doesn't appear in my former nbgrader (V0.6).

remark2 :
Il have edited the ClearSolution. py and add the following lines in the code_stub dictionnary (working fine) :

             OCaml="(* Tapez votre code ici*)",
             lua="-- Tapez votre code ici",
             c = "// Tapez votre code ici",

Thx for helping

[tuncbkose]

I have tried to edit execute.py and remove the second test and output.ename == reply["content"]["ename"], and now it's working fine..

That was added to prevent duplicating errors when a timeout happens. Deleting it is safe, the worst that can happen is some errors will print twice. I'll look into the kernel to see exactly what is happening, but just adding and "ename" in reply["content"] should be good enough to fix this.

[tuncbkose]

That said, this being in ipykernel makes me think that kernels should be providing some sort of error names.

I don't know if that makes sense in OCaml world, but in my mock example

assert(List.rev ["a";"b";"c"] == ["a";"b";"c"])

the error includes Assert_failure, so perhaps there are different types of exceptions defined that a kernel could supply in ename.