[Python] How to make a very simple python script executable AND able to be launched from...

I have a very simple python script. It opens a file and displays some "header" info about it. It works easily on a command line but is a bit cumbersome for my use case. I want to click on a file in Nautilus that this program will read, have it come up under "Open With" and when clicked, display the "header" info. How may this be simply done?

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