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If `systemd-run` [works for you](https://linux.codidact.com/posts/289510#answer-289511), that is probably the simplest thing you can do here.
Otherwise, you can use `os.fork()` [from within Python](https://software.codidact.com/posts/289509#answer-289512) to spawn a child that stays alive after the parent exits.
If someone else is reading this based on the title, but is writing an industrial Python application that doesn't immediately exit, wants to schedule future tasks, and have those tasks be robust across various system events, neither of those solutions is likely to be as robust as using a dedicated service with a name like task scheduler, task queue, or message broker. [Celery](https://docs.celeryq.dev/en/stable/getting-started/introduction.html) is a good example.

Solutions
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The simplest thing you can probably do here is to use [`systemd-run`](https://linux.codidact.com/posts/289510#answer-289511).
If that doesn't work for you, you can use `os.fork()` [from within Python](https://software.codidact.com/posts/289509#answer-289512) to spawn a child that stays alive after the parent exits.
Note
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If someone else is reading this based on the title, but is writing an industrial Python application that doesn't immediately exit, wants to schedule future tasks, and have those tasks be robust across various system events, neither of those solutions is likely to be as robust as using a dedicated service with a name like task scheduler, task queue, or message broker. [Celery](https://docs.celeryq.dev/en/stable/getting-started/introduction.html) is a good example.

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