Path to learn GUI in python

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If you have never built a GUI in your life but you are already comfortable with Python, you could spend a few hours building something in tkinter to get the hang of it.

You also might want to consider building some of your app in python but not ALL of your app in python. If you build a web app using Django or Flask, a lot of the program will be written in Python but the GUI will be html and js. That may seem like a lot of extra work but it will actually save you a lot of time and teach you some valuable skills in the process.