很简单的一段python,但使终无法顺利运行

class MyThread(threading.Thread):

    def __init__(self):
        threading.Thread.__init__(self)

    def run(self):
        print "run"

class Test():
    def __init__(self):
        self.fun2()
    def fun2(self):
        thread = MyThread()
        thread.start()
        thread.join()          ＃就是这行，如果不加，为什么run不跑

def main():
    Test()
    gtk.main()

if __name__ == '__main__':
    main()