结合process进程,实现进程之间的通讯Queue,稍微复杂的运用

#在父进程中创建两个子进程,一个往Queue写数据,一个从Queue里读数据
from multiprocessing import Queue,Process
import time,random

#往消息队列中写入数据 写入的进程 通过消息队列Queue 作为中间人来实现
def write(q):
    for value in ["A","B","C","D"]:
        print('Put %s to queue...'%value)
        q.put(value)
        time.sleep(random.random())

#从消息队列中读取数据 读取的进程
def read(q):
    # time.sleep(1)
    # count = q.qsize()
    # print(count)
    # for i in range(4):
    while True:
        if not q.empty():
            value = q.get()
            # print(value)
            print('Get %s from queue...'%value)
            time.sleep(random.random())
        # else:
        #     break
if __name__ == "__main__":
    #生成一个队列q 可以放无限个消息
    q = Queue()
    pw = Process(target=write,args=(q,))
    pr = Process(target=read,args=(q,))
    pw.start()
    pr.start()