看教程学习，不知道错在哪里了

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()

复制代码

提示错误：
Unhandled exception in thread started by
Error in sys.excepthook:

Original exception was:

希望高手能指点一下，谢谢：）

作者: shrek99 发布时间: 2011-05-10