Why are the Renesas IoT Sandbox Data Intelligence Workflows written in Python? Why not JavaScript?
The article below explains some of the challenges of using JavaScript, including variable scoping. While you’ll probably need JavaScript for your front-end dashboard, it may not be the best choice for back-end data analytics.
If you want to have some fun with Python and IoT data, my article on Dweepy is a good place to start if you have an S5D9 IoT Fast Prototyping Kit.