python的多线程例子

import threading,time

class Demo(threading.Thread):
   def __init__(self,color):
     threading.Thread.__init__(self)

     self.color=color

   def run(self):

    for i in xrange(3):

     print "hello,world", i, self.isAlive(),self.color
     time.sleep(1)

list=[]

for i in xrange(2):
 test=Demo('green')
#test.setDaemon(True)
 test.start()
 list.append(test)
 for test in list:
  test.join(15)

print test.isAlive( ) #### it must be 'False' "
print "main threading exit

test.setDaemon(True),主线程退出，子线程也随着退出。