detect run all cells

[John]

From python code in an ipython notebook cell is it possible to detect how the cell was executed. For instance is the cell being executed from a "shift enter" command or from a "run all cells" command. 

Thanks

John

[Matthias Bussonnier]

Hi John,

No, you cannot detect that. The kernel is not even aware of whether it
is ran from a notebook or any other interface that may not have cells.
Maybe if you shared what you are trying to achieve we can find another solution.

Thanks,
--
Matthias

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[John]

I have a python cell that runs a long duration simulation and moves objects on a canvas on the front end. I would like to receive and process messages from the front end over a Comm channel while the python code is executing in a cell. Such as a mouse event when a user clicks on the canvas element and a message is sent over Comm to the python side. Is there a mechanism in ipython/notebook that will allow me to process a message from the front end while my python code is executing in a cell such as in a while loop that runs forever.

Thanks

John

[Jason Grout]

You can run your long-running code in a separate thread, so that your kernel will be able to respond to comm messages. If your long-running code is running in the main thread, that will block the message processing and your comm messages won't be processed.

Jason

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