Quickfix: jupyter nbconvert with clear-output flag not working

Jupyter comes with a command line utility jupyter nbconvert that can transform a jupyter notebook into different formats. Furthermore, it has options to tweak the output. For instance, the execute flag executes the notebook before transforming it while the clear-output flag is supposed to remove outputs from the notebook. Thus, if you want to execute the notebook notebook.ipynb and transform it into a pdf file afterwards, you can issue the command

jupyter nbconvert notebook.ipynb --execute --to pdf

I stumbled upon the following problem when I tried to create a make target for the SCP project. The make target should do the following: It should clear the output of a specified notebook, execute it and then export it as a pdf file.

Problem description

In contrast to its purpose, the clear-output flag does not remove the output from any notebook. Suppose your Jupyter notebook is notebook.ipynb. Then,

jupyter nbconvert --clear-output notebook.ipynb

merely saves the file notebook.ipynb again. The output remains in the notebook.

Solution

Unfortunately, this still seems to be an open issue. However, there is a more specific version of the command available that does exactly what we want:

jupyter nbconvert --ClearOutputPreprocessor.enabled=True --inplace notebook.ipynb

It is not clear to me what the current status of the issue is; in fact, there are recent commits in other projects referencing the issue and the issue itself is labeled as upstream. Apparently, a dependency (traitlets) is causing this bug.

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