How to split and merge cells in JupyterLab

Question

• In JupyterLab, given the following code cell, how may it be split into multiple cells?

• Likewise, given the following cells, how may they be combined into a single cell?

Answer 1

When working directly with JupyterLab, not in an IDE.

• JupyterLab: splitCell
  • Source
• In order to split one cell into many cells:
  • Place cursors where the split is desired, and then press and release ctrl + shift + -
  • Multiple cursors may be placed, by holding ctrl, and clicking the location for the cursor.

• JupyterLab: mergeCells
  • Source
• In order to merge multiple cells, into one cell:
  • Select the desired, consecutive cells, by holding shift, and clicking in the margin, where the [ ] is, which will highlight the selected cells.
  • While still holding shift, press m, and then release both keys.

• The resulting merged cell, will have a space between the code from each cell, as does the first image in this answer.
  • This is the expected behavior newModel.value.text = toMerge.join('\n\n');

Answer 2

For those that come here for Jupyter in VSCode, you can merge cells by:

1. Selecting the cells (using shift + arrow is supported)
2. Right click > Join With Previous Cell (or Join With Next Cell)

Join With Previous Cell key: Shift+Alt+Windows+J

Join With Next Cell key: Alt+Windows+J

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NOTE: that it will join the selected range + previous or next cell. So, if you just want to merge two cell, no need to select using shift + arrow.