title: How can I comment out multiple cells in Jupyter Ipython / JupyterLab notebook?
body: <p>How can I comment out multiple cells in Jupyter Ipython / JupyterLab notebook? The code is in Python.</p>
  
  <p>The keyboard shortcuts <kbd>Ctrl</kbd> + <kbd>/</kbd> on Microsoft Windows and <kbd>Cmd</kbd> + <kbd>/</kbd> 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.</p>
  
  <hr>
  
  <p>Selecting several cells can be done by clicking on the margin of cell, then holding <kbd>CTRL</kbd> or <kbd>SHIFT</kbd>, and clicking on the margin of another cell:</p>
  
  <p><a href="https://i.stack.imgur.com/Uautv.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Uautv.png" alt="enter image description here"></a></p>