Using Python to delete files based on other files’ names

I recently asked subscribers to my free, weekly “better developers” newsletter to send me their Python programming questions, promising that (a) I’d try to solve them, and publish the result to YouTube, and (b) anyone who submitted a problem that I selected would then get a coupon for 30% off of any of my books or courses.

Reader Harry submitted a great question about filenames, which I solve below. Thanks, Harry!