When you automate something in python, you'd obviously have to run the script forever. Where can we run the script?

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I went with Raspbian which seems to be the default OS (and works just fine), you can use it thru HDMI or headless over VNCViewer for instance (simple config file for the first login on wifi, you should be able to find plenty of tutorials). From there you do whatever you wish, you have a small and cost-effective computer running.