Tornado — Python Async Web Framework and Networking Library

pip install tornado

import tornado.ioloop
import tornado.web
import json

class AssetsHandler(tornado.web.RequestHandler):
    def get(self):
        self.write(json.dumps([{"repo": "react", "stars": 230000}]))

    def post(self):
        data = json.loads(self.request.body)
        self.set_status(201)
        self.write(json.dumps(data))

class WebSocketHandler(tornado.websocket.WebSocketHandler):
    connections = set()

    def open(self):
        self.connections.add(self)

    def on_message(self, msg):
        for conn in self.connections:
            conn.write_message(msg)

    def on_close(self):
        self.connections.discard(self)

app = tornado.web.Application([
    (r"/api/assets", AssetsHandler),
    (r"/ws", WebSocketHandler),
])

if __name__ == "__main__":
    app.listen(8888)
    tornado.ioloop.IOLoop.current().start()