Hi Ricardo,


On 21/09/15 16:28, Ricardo Wurmus wrote:
> Hi Guix,
>
> I’m trying to package Jupyter (an improved version of IPython, from what
> I’ve heard) and noticed that the tests for jupyter-client fail because
> the native “python3” (or “python2”) kernel cannot be found.  According
> to the documentation, this “kernel” should always be available and
> doesn’t need to be installed.
>
> Looking around in the sources of python-ipython (an input to the Jupyter
> packages I’m working on) I see that this file
>
>     $out/lib/python2.7/site-packages/IPython/kernel/kernelspec.py
>
> contains hard-coded system paths:
>
>     SYSTEM_KERNEL_DIRS = ["/usr/share/jupyter/kernels",
>                           "/usr/local/share/jupyter/kernels",
>                          ]
>
> Yet I have not found any directory named “kernels” in the output of the
> python-ipython package.  Nor have I found any “kernel.json” files.  It
> seems to me that IPython should install at least the native kernel at
> some point, but currently doesn’t seem to include it.
>
> I would like to fix this, but I really don’t know anything about IPython
> and I don’t even know what the word “kernel” describes in this context.
> Could someone with an understanding of IPython please take a look at
> this?

looking at setup.py [0] it seems to be a separate module that is pulled
in when setup.py is run. 

Are we depending on requirements.txt to give us this information, as
this seems to be absent from this project?

if so, I've attached a requirements.txt for python 2 and 3 generated
from version in pypi.  I expect the reason that it is not included in
the package is that it's different depending on the python version.


Regards

Craig

[0] https://github.com/jupyter/jupyter/blob/master/setup.py