• Python 用队列实现多线程并发


    https://www.cnblogs.com/yeayee/p/5181193.html

    # Python queue队列,实现并发,在网站多线程推荐最后也一个例子,比这货简单,但是不够规范

    # encoding: utf-8
    __author__ = 'yeayee.com' # 由本站增加注释,可随意Fork、Copy

    from queue import Queue # Queue在3.x中改成了queue
    import random
    import threading
    import time


    class Producer(threading.Thread):
    """
    Producer thread 制作线程
    """
    def __init__(self, t_name, queue): # 传入线程名、实例化队列
    threading.Thread.__init__(self, name=t_name) # t_name即是threadName
    self.data = queue

    """
    run方法 和start方法:
    它们都是从Thread继承而来的,run()方法将在线程开启后执行,
    可以把相关的逻辑写到run方法中(通常把run方法称为活动[Activity]);
    start()方法用于启动线程。
    """

    def run(self):
    for i in range(5): # 生成0-4五条队列
    print("%s: %s is producing %d to the queue!" % (time.ctime(), self.getName(), i)) # 当前时间t生成编号d并加入队列
    self.data.put(i) # 写入队列编号
    time.sleep(random.randrange(10) / 5) # 随机休息一会
    print("%s: %s producing finished!" % (time.ctime(), self.getName)) # 编号d队列完成制作


    class Consumer(threading.Thread):
    """
    Consumer thread 消费线程,感觉来源于COOKBOOK
    """
    def __init__(self, t_name, queue):
    threading.Thread.__init__(self, name=t_name)
    self.data = queue

    def run(self):
    for i in range(5):
    val = self.data.get()
    print("%s: %s is consuming. %d in the queue is consumed!" % (time.ctime(), self.getName(), val)) # 编号d队列已经被消费
    time.sleep(random.randrange(10))
    print("%s: %s consuming finished!" % (time.ctime(), self.getName())) # 编号d队列完成消费


    def main():
    """
    Main thread 主线程
    """
    queue = Queue() # 队列实例化
    producer = Producer('Pro.', queue) # 调用对象,并传如参数线程名、实例化队列
    consumer = Consumer('Con.', queue) # 同上,在制造的同时进行消费
    producer.start() # 开始制造
    consumer.start() # 开始消费
    """
    join()的作用是,在子线程完成运行之前,这个子线程的父线程将一直被阻塞。
      join()方法的位置是在for循环外的,也就是说必须等待for循环里的两个进程都结束后,才去执行主进程。
    """
    producer.join()
    consumer.join()
    print('All threads terminate!')


    if __name__ == '__main__':
    main()


    """运行结果:

    Thu Feb 4 11:05:48 2016: Pro. is producing 0 to the queue!
    Thu Feb 4 11:05:48 2016: Pro. is producing 1 to the queue!
    Thu Feb 4 11:05:48 2016: Con. is consuming. 0 in the queue is consumed!
    Thu Feb 4 11:05:49 2016: Pro. is producing 2 to the queue!
    Thu Feb 4 11:05:50 2016: Pro. is producing 3 to the queue!
    Thu Feb 4 11:05:51 2016: Pro. is producing 4 to the queue!
    Thu Feb 4 11:05:52 2016: Con. is consuming. 1 in the queue is consumed!
    Thu Feb 4 11:05:53 2016: <bound method Producer.getName of <Producer(Pro., started 6864)>> producing finished!
    Thu Feb 4 11:06:00 2016: Con. is consuming. 2 in the queue is consumed!
    Thu Feb 4 11:06:06 2016: Con. is consuming. 3 in the queue is consumed!
    Thu Feb 4 11:06:06 2016: Con. is consuming. 4 in the queue is consumed!
    Thu Feb 4 11:06:12 2016: Con. consuming finished!
    All threads terminate!

    """

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  • 原文地址:https://www.cnblogs.com/lgqboke/p/9506348.html
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