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Comments on How can I schedule a later task in Python?
Parent
How can I schedule a later task in Python?
I want my CLI Python program to schedule a task, and then exit. After some times has passed (say 10 minutes) the task should execute.
The task can be a Python method or a shell command, whatever is easier. I can convert my use case to accommodate it.
This would be on Linux only.
How can I schedule a future task from Python?
Post
Use at to schedule the command, using subprocess from Python to invoke at. It doesn't even require shell=True. For example:
import shlex, subprocess
subprocess.run(
# `at` command to run now
shlex.split("at now +10 minutes"),
# shell command that `at` will schedule, provided to `at`'s stdin
input="python -m this > this.txt",
# open stdin in text mode with the default encoding
text=True
)
The at program will detach itself from the terminal, so capturing stdout or stderr from the scheduled task will require a workaround (such as invoking xterm, or teeing to a TTY that will be open when the task runs).
However, if local mail services are available, and at is run from a su shell, it will send local mail with the output when the job is completed. Check the man page for details.
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