sys.exit() method is used to exit the python interpreter

I have been going through the Django source code in file 

*django/utils/autoreload.py*def reloader_thread():
    ensure_echo_on()
    while RUN_RELOADER:
        if code_changed():
              *sys.exit(3) # force reload*             
        time.sleep(1)




*when code is changed that line executed, should not it stop executing but 
it keep on listening if code is changed or not.what happens behind the 
scene, when sys.exit(3) is executed. *

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