[{'from': 'human', 'value': 'Write a basic push service utilizing WebSockets.'}, {'from': 'gpt', 'value': "Sure, here's a basic example of a WebSocket-based push service that can send push notifications to clients:\n\nServer-side (Node.js and WebSocket library):\n```\nconst WebSocket = require('ws');\n\n// create a new WebSocket server on port 8080\nconst wss = new WebSocket.Server({ port: 8080 });\n\n// array to store connected clients\nconst clients = [];\n\n// when a client connects to the server\nwss.on('connection', (ws) => {\n  // add the client to the list of connected clients\n  clients.push(ws);\n\n  // when a message is received from a client\n  ws.on('message', (message) => {\n    console.log(`Received message: ${message}`);\n\n    // send the message to all connected clients\n    clients.forEach((client) => {\n      if (client.readyState === WebSocket.OPEN) {\n        client.send(message);\n      }\n    });\n  });\n\n  // when a client disconnects\n  ws.on('close', () => {\n    // remove the client from the list of connected clients\n    clients.splice(clients.indexOf(ws), 1);\n  });\n});\n```\n\nClient-side (JavaScript):\n```\nconst ws = new WebSocket('ws://localhost:8080');\n\n// when the WebSocket connection is established\nws.addEventListener('open', (event) => {\n  console.log('WebSocket connection established');\n});\n\n// when a message is received from the server\nws.addEventListener('message', (event) => {\n  console.log(`Received message: ${event.data}`);\n});\n\n// send a message to the server\nws.send('Hello, server!');\n```\n\nThis is a very basic example, but it should give you an idea of how a WebSocket-based push service can be implemented. In this example, the server sends any message it receives from a client to all connected clients, and the clients simply log any messages they receive from the server. In a real-world push service, you would likely want to customize the behavior based on your specific use case."}, {'from': 'human', 'value': 'What python package should I use if I want to implement it with python?'}]