Stand on a rug. Now change out the rug that’s underneath you. It’s pretty hard to do while standing in the rug, isn’t it?
It’s the same way with code. It’s very hard to alter code while it’s running because if you touch the wrong thing at the wrong time, everything can go wrong. The operating system is the most basic function of the computer, and if something goes wrong there, you will have to reinstall the entire operating system.
Open a file on your computer and then try to delete it while it’s open. You’ll run into the same issue because the computer is currently using the data you’re trying to delete.
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