[Python] How to exit python deamon thread gracefully

I have code like below

def run():
While True:
doSomething()
def main():
thread = threading.thread(target = run)
thread.setDaemon(True)
thread.start()
doSomethingElse()


if I Write code like above, when the main thread exits, the Deamon thread will exit, but maybe still in the process of doSomething.

The main function will be called outside, I am not allowed to use join in the main thread, is there any way I can do to make the Daemon thread exit gracefully upon the main thread completion.

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