Source code formatting in IPython notebooks

First, let me mention that when Jupyter notebooks are running only IPython kernels, they still are IPython notebooks. ;)

If you would like automatic source code formatting in Jupyter notebooks, follow these instructions.

I'm using the black Python formatter for this and the pip package nb_black from Khoa Duong to achieve this.

First, install nb_black which will automatically pull in the black formatting package:

pip install nb_black

Now your first cell in a Jupyter notebook should be:

%load_ext nb_black

or, in a jupyterlab notebook:

%load_ext lab_black.

If there's ever a problem with the source code formatting, simply don't execute the first cell while running the notebook.