AttributeError: kernelspec

[bisgaard-itis]

🐛 Bug

When using the Papermill version 2.5.0 I encountered an issue when using parametrized notebooks. I believe this is a bug because it doesn't happen in version 2.4.0.

I have created a small test case which reproduces the bug:
testcase.zip
The zip contains test.py and test.ipynb which should sit next to each other when test.py is run. The log I get when I run this test case is

Traceback (most recent call last):
  File "/home/mads/Development/oSparc/osparc-simcore-clients/clients/python/test/e2e/test.py", line 12, in <module>
    pm.execute_notebook(
  File "/home/mads/Development/oSparc/osparc-simcore-clients/.venv/lib/python3.10/site-packages/papermill/execute.py", line 94, in execute_notebook
    parameter_predefined = _infer_parameters(nb)
  File "/home/mads/Development/oSparc/osparc-simcore-clients/.venv/lib/python3.10/site-packages/papermill/inspection.py", line 41, in _infer_parameters
    kernel_name = nb.metadata.kernelspec.name
  File "/home/mads/Development/oSparc/osparc-simcore-clients/.venv/lib/python3.10/site-packages/nbformat/_struct.py", line 125, in __getattr__
    raise AttributeError(key) from None
AttributeError: kernelspec

[MSeal]

Thanks for raising with an example. I'll take a look this week and see what the root problem is, though the code related to this shouldn't have changed in papermill iirc.

[MSeal]

Found the issue -- technically the notebook spec requires it specify some metadata that a new code path reads. Other paths in papermill raise a clearer message and require an metadata override argument in these cases. I'll unify the pattern a bit here and get a patch release going.

[bisgaard-itis]

Found the issue -- technically the notebook spec requires it specify some metadata that a new code path reads. Other paths in papermill raise a clearer message and require an metadata override argument in these cases. I'll unify the pattern a bit here and get a patch release going.

Thanks @MSeal. We use Papermill in our testing, so we very much appreciate the quick response time here 😄 👍🏻