Python example of using websocket service to transmit data, which can maintain a long connection

Because we have been sending text messages (http) for a long time, we hope to have a phone call (websocket); with the phone, we can enjoy traffic (duplex communication), so we talk word by word (network packet by packet); in order It allows the other party to clearly understand what we mean, so what we say is full of yin and yang, with a slight pause (the length of the package), so that the other party can get our point.

First install websocket dependencies:

pip install websockets

websocket server:

#!/usr/bin/env python

import asyncio
import websockets


async def echo(websocket):
    while True:
        name = await websocket.recv()
        print(f"接收到消息：{name}")
        replay = f"Hello {name}"
        await websocket.send(replay)
        print(f"发送消息结束")


async def main():
    async with websockets.serve(echo, "localhost", 8765):
        print("服务端启动成功：ws://localhost:8765")
        await asyncio.Future()  # run forever


asyncio.run(main())

 websocket client:

#!/usr/bin/env python

import asyncio
import time
import websockets


async def hello():
    async with websockets.connect("ws://localhost:8765") as websocket:
        while True:
            await websocket.send("Hello world!")
            message = await websocket.recv()
            print(f"Received: {message}")
            time.sleep(1)


asyncio.get_event_loop().run_until_complete(hello())

Run the server first, then the client:

Then start the client: 

Or you can use postman to connect: