I don't know how general this need is, but I would SO like there to be a 
single-key short cut for the notebook and lab environments to restart, 
clear outputs, and run all cells, without interposing a scary dialog box 
requiring a response. Just hit F5 or some other key and start over.

In Jupyter notebook there are menu options Kernel > Restart & Clear Output 
and Kernel > Restart and Run All. 

In Jupyterlab there are menu options Run > Restart Kernel and Run All 
Cells, Kernel > Restart Kernel and Run All Cells, and Kernel> Restart 
Kernel and Clear All Outputs.

All of these take one to a dialog box that warns you that all variables 
will be lost, and this intrusive behavior could be maintained for the menu 
options, but I would REALLY like having the option to just press a key and 
not be interrupted by a dialog box, something that is available in all 
other programming environments with which I'm familiar.

A related question: I see how to override a key binding in Jupyterlab, but 
a) there remains the issue of eliminating the intrusive dialog box and b) I 
don't see an example of how to bind a menu option to a function key such as 
F5.

Bruce

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