Sort imports using isort

This nbextension sorts imports in notebook code cells.

Under the hood, it uses a call to the current notebook kernel to reformat the code. The conversion run by the kernel uses Python’s package isort by Timothy Edmund Crosley.

The nbextension provides

  • a toolbar button (configurable to be added or not)

pre-requisites: of course, you must have the corresponding package installed:

pip install isort [--user]


All options are provided by the KerneExecOnCells library. There are a few nbextension-wide options, configurable using the jupyter_nbextensions_configurator or by editing the notebook section config file directly. The options are as follows:

  • isort.add_toolbar_button: Whether to add a toolbar button to transform the selected cell(s). Defaults to true.
  • isort.button_icon: A font-awesome class defining the icon used for the toolbar button and actions. See fontawesome for available icon classes. Defaults to fa-sort.
  • isort.show_alerts_for_errors: Whether to show alerts for errors in the kernel calls. Defaults to false.
  • isort.button_label: Toolbar button label text. Also used in the actions’ help text. Defaults to Sort imports with isort.
  • isort.kernel_config_map_json: The value of this key is a string which can be parsed into a json object giving the config for each kernel language.


Under the hood, this nbextension uses the kerneexeconcells library, a shared library for creating Jupyter nbextensions which transform code cell text using calls to the active kernel.

See the shared README and kerneexeconcells library for the internal model used by the nbextension.