python的thread使用

#encoding:utf-8import threadimport timedef print_time(threadName, delay):    count = 0    while count < 5:        time.sleep(delay)        count += 1        print "%s: %s" % (threadName, time.ctime(time.time()))        try:    thread.start_new_thread( print_time, ("Thread-1", 2, ) )    thread.start_new_thread( print_time, ("Thread-2", 4, ) )except:    print "Error:unable tostart thread"while 1:    pass