python队列join

如果要让一个任务队列按照顺序进行，则必须使用join,代码如下：

'''

Created on Dec 23, 2013

@author: long

'''

import threading

from threading import Thread

import time

class Thread1(Thread):

    '''

    classdocs

    '''

    def __init__(self,thread_name):

        '''

        Constructor

        '''

        Thread.__init__(self,name=thread_name)

    def run(self):

        '''

        run method

        '''

        count = 0

        while True:

            print ('thread--',self.getName(),",count:",count)

            time.sleep(0.5)

            count = count + 1

            if count > 10:

                break

def main():

    for y in range(1, 3):

        thread1 = Thread1('longthread' + str(y))

        thread1.start()

        if thread1.isAlive():

            thread1.join()

    for i in range(50):

        print ('main:', i)

if __name__ == "__main__":

    main()

　结果是先执行名为'longthread1',再'longthread2'，再是主进程，所以thread1.join()的意思是等thread1执行完，再去执行其他线程。