Multitasking -python achieve - using a queue to complete the inter-process communication (2.1.8)

@ (Using a queue to complete the inter-process communication)

1. Why use queue

It is between processes independent of each other, and the thread can share global variables
so if you want to talk inter-process data exchange
only through inter-process communication, such as socket. Too much trouble
here using the queue
Queue features: FIFO

2.python code implementation

 import multiprocessing

def download_from_web(q):
    """下载数据"""
    #模拟从网上下载数据
    data = [11,22,33,44]

    #向队列写入数据
    for temp in data:
        q.put(temp)

    print("下载器已经下载完了数据并存入了队列中")


def analysis_data(q):
    """数据处理"""
    waitting_analysis_data = list()
    #从队列中获取数据
    while True:
        data = q.get()
        waitting_analysis_data.append(data)
        if q.empty():
            break
    print(waitting_analysis_data)

def main():
    #1.创建一个队列
    q = multiprocessing.Queue()

    #创建多个进程，将队列的引用当做实参进行传递
    p1 = multiprocessing.Process(target=download_from_web,args=(q,))
    p2 = multiprocessing.Process(target=analysis_data,args=(q,))

    p1.start()
    p2.start()

if __name__ == '__main__':
    main()