Python await a function with loop inside

I am using the Sanic as the server and try to handle multiple request concurrently.

I have used the await for the encode function(I use for loop to simulate do something) but when I try the time curl http://0.0.0.0:8000/ in two separate consoles, it doesn't run concurrently.

I have searched google but only find event_loop but it is to schedule registered conroutines.

How do I await the for loop so the requests won't be blocked?

Thank you.

from sanic import Sanic
from sanic import response
from signal import signal, SIGINT
import asyncio
import uvloop

app = Sanic(__name__)


@app.route("/")
async def test(request):
    # await asyncio.sleep(5)
    await encode()
    return response.json({"answer": "42"})

async def encode():
    print('encode')
    for i in range(0, 300000000):
        pass

asyncio.set_event_loop(uvloop.new_event_loop())
server = app.create_server(host="0.0.0.0", port=8000)
loop = asyncio.get_event_loop()
task = asyncio.ensure_future(server)
signal(SIGINT, lambda s, f: loop.stop())
try:
    loop.run_forever()
except:
    loop.stop()