python async web server with async pg backend

async_server.py

import asyncio
import asyncpg
from aiohttp import web


async def handle(request):
    """Handle incoming requests."""
    pool = request.app['pool']
    power = int(request.match_info.get('power', 10))

    # Take a connection from the pool.
    async with pool.acquire() as connection:
        # Open a transaction.
        async with connection.transaction():
            # Run the query passing the request argument.
            result = await connection.fetchval('select 2 ^ $1', power)
            return web.Response(
                text="2 ^ {} is {}".format(power, result))


async def init_app():
    """Initialize the application server."""
    app = web.Application()
    # Create a database connection pool
    app['pool'] = await asyncpg.create_pool(database='paperboy', user='paperboy', password='sillypass')
    # Configure service routes
    app.router.add_route('GET', '/{power:\d+}', handle)
    app.router.add_route('GET', '/', handle)
    return app


loop = asyncio.get_event_loop()
app = loop.run_until_complete(init_app())
web.run_app(app)