JupyterLab 3.4.0 is released!

JupyterLab 3.4.0 Release

Here are the new cool features available in JupyterLab 3.4.0.

The full changelog is available there.

:hammer_and_wrench: Cell toolbar

This version adds a cell toolbar.

That toolbar is displayed for the current active cell if it does not overlap with the content.

:heavy_plus_sign: New tab button

There is now a new tab button in the dock panel tab bars.

:first_quarter_moon: Themed Vega Figure

The Vega figures will now respect the theme mode (light or dark).

:gear: Settings Editor

The settings editor is now displaying the default value if the current value is a customized value.

:open_book: Context menu order

The context menu ordering has been updated to move Paste closer to Cut and Copy.

Old context menu on the left, new context menu on the right


Thanks for the summary

This looks great! Really like the cell toolbar and new tab button. :slight_smile:

Is there also an easy way to add you own button to the cell toolbar through an extension? Tutorial available / in the making?


Hey @ivgent

Here is gist with customization example of menus and toolbars: JupyterLab custom menu Β· GitHub

It adds a clear output button in the cell toolbar:


The relevant setting is:

  "@jupyterlab/cell-toolbar-extension:plugin": {
    "toolbar": [
      { "name": "clear-output", "command":"notebook:clear-cell-output", "icon": "ui-components:close" }

This is the Cell Toolbar settings section

The available commands is not in the stable documentation. But you can have a look a the dev documentation (most of them are available in 3.4): Commands β€” JupyterLab 4.0.0a24 documentation

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