Detecting computer/program shutdown in Python?

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This is the wrong way to go about performing action at system shutdown time. The job of the shutdown process is to stop running processes and then switch off power; if you try to detect this happening from within your program and react by getting some last action in, it’s a race between the OS and your program who gets to go first. More likely than not your program will have been stopped before it managed to perform the necessary action.

Instead, you should hook into the normal protocol for doing things at shutdown. This will tell the shutdown utility to send an explicit signal to your program and wait for it to be acknowledged, which gives you enough time (within reason) to do what you have to do. How exactly to register to be notified varies with the OS, so this is more of an OS-specific question rather than a Python question.

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