Open Excel, and you will see a new tab in the ribbon at the top that says PyXLL.

Some members may not see Python in Excel as an option yet; Microsoft stated this beta will be rolled out in waves. Users with the Public Preview will be able to see Python in the Excel ribbon menu.

As someone who often works with Python scripts, Jupyter Notebook is my favorite tool for making notes during lectures and sharing my painstakingly-written code with my programming friends and rivals.