REST APIs with Flask and Python - Writing Your First Python App

This video tutorial guides viewers through building a simple app that calculates the number of months equivalent to a user's age. It covers obtaining user input, converting it to an integer, performing calculations, and printing results using F strings. The tutorial also suggests extending the app to calculate seconds and offers tips for simplifying the code by removing unnecessary variables. The video concludes with encouragement to explore further extensions.

Why is it recommended to use an F string for printing the output?

What extension does the teacher suggest for further development of the app?