gistfile1.py

import json
import time

from tornado import gen
from tornado.web import RequestHandler


def get_data(id):
    time.sleep(3)
    data = {'hello': 'world'}
    return data


class ExampleHandler(RequestHandler):
    @gen.coroutine
    def get(self, id):
        print 'Request started'
        data = yield self.application.executor.submit(get_data, id)
        self.write(json.dumps(data))
        self.finish()