Allow the execute preprocessor to make use of an existing kernel

[SylvainCorlay]

@Carreau this appears to be working and doing what I need.

[Carreau]

LGTM, does this allow you to both pass a already tarted kernel and not stop it at the end ?

[SylvainCorlay]

Yes, if a kernel is passed to the preprocessor, it won't try to shut it down.

[SylvainCorlay]

from nbconvert.preprocessors.execute import executenb, ExecutePreprocessor
from nbformat import read as nbread
from jupyter_client.manager import start_new_kernel
 
nb = nbread('parsee.ipynb', as_version=4)
kernel_name = nb.metadata.get('kernelspec', {}).get('name', 'python')
km, kc = start_new_kernel(kernel_name=kernel_name)
executenb(nb, kernel=(km, kc))
kc.execute_interactive('a')  # a is a variable defined in parsee.ipynb with 'a = 1'

[Carreau]

I'll a chance for @mpacer to review and see if it affects papermill.

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[SylvainCorlay]

It should not change anything for papermill because start_new_kernel still is there and behaves the same when you don't provide a kernel manager.

[Carreau]

Ok, let's get that in.