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此章节关于如何在后台运行一个进程，其中的范例存在根本性错误。
import multiprocessingimport timedef foo(): name = multiprocessing.current_process().name print("Starting %s " % name) time.sleep(3) print("Exiting %s " % name)if __name__ == '__main__': background_process = multiprocessing.Process(name='background_process', target=foo) background_process.daemon = True NO_background_process = multiprocessing.Process(name='NO_background_process', target=foo) NO_background_process.daemon = False background_process.start() NO_background_process.start()其中，守护进程的生命周期是跟随父进程的，当主进程结束，其创建的守护进程也随之结束，而非守护进程则会继续运行，如果尝试对守护进程使用join()或者让主进程在创建完两个子进程后保持一段时间，会发现守护进程也会有屏幕输出。
import multiprocessingimport timedef foo(): name = multiprocessing.current_process().name print("Starting %s " % name) time.sleep(3) print("Exiting %s " % name)if __name__ == '__main__': background_process = multiprocessing.Process(name='background_process', target=foo) background_process.daemon = True NO_background_process = multiprocessing.Process(name='NO_background_process', target=foo) NO_background_process.daemon = False background_process.start() NO_background_process.start() time.sleep(10)Metadata
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