推荐使用python3.6以上版本来运行websockets
pip3 install websockets
主要用到的API有：
websockets.connect()
websockets.send()
websockets.recv()
server.py，用于搭建webscocket服务器，在本地8765端口启动，接收到消息后会在原消息前加上I got your message:再返回去。
import asyncio
import websockets
async def echo(websocket, path):
async for message in websocket:
message = "I got your message: {}".format(message)
await websocket.send(message)
asyncio.get_event_loop().run_until_complete(websockets.serve(echo, 'localhost', 8765))
asyncio.get_event_loop().run_forever()
client.py
#!/usr/bin/env python
import asyncio
import websockets
async def hello(uri):
async with websockets.connect(uri) as websocket:
await websocket.send("hello world")
print("< HELLO WORLD")
while True:
recv_text = await websocket.recv()
print("> {}".format(recv_text))
asyncio.get_event_loop().run_until_complete(hello('ws://localhost:8765'))
先执行server.py，然后执行client.py，client.py的输出结果如下：
< Hello world!
> I got your message: Hello world!
> 2021-03-03 15:11:50
客户端发送了第一条消息给服务端，服务端接收到后发送了第二条消息，最后一条消息是由服务端主动发送给客户端的。