个人理解的定义

高效、低延迟、可重用的消息传递系统（或消息传递层，有点类型网络协议，但不是消息队列）

基于python3和ZMQ做进程间通信示例:

# 本脚本用于从zmq队列中接收订阅的数据
import time
import json
import zmq


def subscriber(code: str):
    # Create a new ZeroMQ context
    context = zmq.Context()

    # Create a SUB socket
    socket = context.socket(zmq.SUB)

    # Connect to the publisher's address
    socket.connect("tcp://localhost:5555")

    # Subscribe to all messages (empty string as a subscription)
    socket.setsockopt_string(zmq.SUBSCRIBE, "")

    while True:
        # Receive a message
        message = socket.recv_string()
        # print('message=%s' % message)
        msg_dict: dict = json.loads(message)

        if msg_dict['type'] == 'MarketData':
            index_data_str = msg_dict['body']

            try:
                # # 打印字符串长度和内容
                # print("String length:", len(index_data_str))
                # print("String content:", index_data_str)

                # 解析 JSON 字符串
                data = json.loads(index_data_str)

                # 提取指数的合约的代码
                instrument_str = data.get('instrument')
                if instrument_str == code:
                    # 提取 'highestPrice' 字段的值
                    lastPrice = data.get('lastPrice')
                    print('instrument', instrument_str)

                    print("lastPrice Price:", lastPrice)
            except json.JSONDecodeError as e:
                print(f"JSON decode error: {e}")


if __name__ == "__main__":
    # 三大指数
    subscriber('000300')
    subscriber('000905')
    subscriber('000852')