pip install websockets

broadcast.server.py

#!/usr/bin/env python

import asyncio
import websockets

connected = set()
async def broadcast(websocket):
    connected.add(websocket)
    async for message in websocket:
        websockets.broadcast(connected, message)

async def main():
    async with websockets.serve(broadcast, "localhost", 8765):
        await asyncio.Future()  # run forever

asyncio.run(main())

broadcast.server.sh

echo '#!/usr/bin/env python

import asyncio
import websockets

connected = set()
async def broadcast(websocket):
    connected.add(websocket)
    async for message in websocket:
        websockets.broadcast(connected, message)

async def main():
    async with websockets.serve(broadcast, "localhost", 8765):
        await asyncio.Future()  # run forever

asyncio.run(main())' | python3