python的thread使用

#encoding:utf-8
import thread
import time

def 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