python错误Unhandled exception in thread started by Error in sys.excepthook

import time
import thread
def timer(no, interval):
 cnt = 0
 while cnt<10:
 print 'Thread:(%d) Time:%s/n'%(no, time.ctime())
 time.sleep(interval)
 cnt+=1
 thread.exit_thread()
 
def test(): #Use thread.start_new_thread() to create 2 new threads
 thread.start_new_thread(timer, (1,1))
 thread.start_new_thread(timer, (2,2))
 
if __name__=='__main__':
 test()

出现错误

Unhandled exception in thread started by

Error in sys.excepthook:

Original exception was:

解决方法：将主函数改为

<pre>if __name__=='__main__':
 test()
time.sleep(3)

至于为什么要睡几秒，不是很清楚
网上的说法是不建议使用thread，应尽量使用threading.Thread类