了解Python守护进程线程

考虑以下几点:

daemonic.py

import sys, threading, time

class TestThread(threading.Thread):
    def __init__(self, daemon):
        threading.Thread.__init__(self)
        self.daemon = daemon

    def run(self):
        x = 0
        while 1:
            if self.daemon:
                print "Daemon :: %s" % x
            else:
                print "Non-Daemon :: %s" % x
            x += 1
            time.sleep(1)

if __name__ == "__main__":
    print "__main__ start"
    if sys.argv[1] == "daemonic":
        thread = TestThread(True)
    else:
        thread = TestThread(False)
    thread.start()
    time.sleep(5)
    print "__main__ stop"

从python文档:

整个Python程序在 没有活动的非守护进程线程。

因此,如果我将TestThread作为守护进程运行,我希望它在主线程完成后退出。但这不会发生:

> python daemonic.py daemonic
__main__ start
Daemon :: 0
Daemon :: 1
Daemon :: 2
Daemon :: 3
Daemon :: 4
__main__ stop
Daemon :: 5
Daemon :: 6
^C

我还不明白什么?