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!
"""
