python - Why doesn't daemon thread die when its environment is destroyed? -


i have python script starts thread thread. learning exercise realise ability kill python thread, have use in application writing. ignoring red herring, thread firstthread starts thread secondthread our purposes caught in loop , has no resources release. consider:

import threading import time   class firstthread (threading.thread):     def run(self):         b = secondthread()         b.daemon = true         b.start()         time.sleep(3)         print("firstthread going away!")         return true   class secondthread (threading.thread):     def run(self):         while true:             time.sleep(1)             print("secondthread")   = firstthread() a.daemon = true a.start()   print("waiting 5 seconds.") time.sleep(5) print("done waiting")

although firstthread print "firstthread going away!" after 3 seconds expected, secondthread continues print "secondthread" stdout. expected secondthread destroyed firstthread destroyed a daemon thread. why secondthread continue exist though environment (firstthread) has been destroyed?

threads not hierarchical in nature. afaik, thread maintains closure on environment created in it. threads owned process. daemon thread thread not joined before application exits. in short, there no tie between firstthread , secondthread in example.


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