[Python] How can I comment out multiple cells in Jupyter Ipython / JupyterLab notebook?

How can I comment out multiple cells in Jupyter Ipython / JupyterLab notebook? The code is in Python.

The keyboard shortcuts Ctrl + / on Microsoft Windows and Cmd + / on Mac OS X only work if the selected code is within one cell. However, if I select several cells, then these keyboard shortcut don't work anymore.


Selecting several cells can be done by clicking on the margin of cell, then holding CTRL or SHIFT, and clicking on the margin of another cell:



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