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Notebook cell execution #169

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@davidbrochart

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@davidbrochart

Problem

Today at the Jupyter Server meeting we talked about notebook restoration, where RTC could be a solution (see jupyter-server/jupyter_server#900). In that solution, the frontend just displays live changes to the notebook shared model. But currently, a notebook cell execution is either None or an integer greater than 0, so there is no way to show that a cell is executing.

Proposed Solution

We could encode the "cell executing" state in the execution count, for instance as "*". I think it could even be part of nbformat, because it brings some information about the state of the notebook at the time it was saved.

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