Understanding Asyncio Snippets

fetch_app.py

import asyncio
import aiohttp
from quart import Quart

app = Quart(__name__)


async def fetch(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as response:
            html = await response.read()
            return {
                "resp": response,
                "html": html,
                "url": url,
            }


@app.route("/")
async def hello():
    urls = [
        "https://whatisjasongoldstein.com/",
        "https://betheshoe.com/",
        "https://theportfolioapp.com/",
        "https://www.theatlantic.com/",
        "https://www.example.org/",
        "https://www.google.com/",
        "https://badurl.whatisjasongoldstein.com/",
    ]
    futures = [asyncio.ensure_future(fetch(url)) for url in urls]

    output = ""
    for future in futures:
        try:
            resp = await future
        except Exception as error:
            output += "<p><b>Error:</b> %s<p>" % error
            continue
        else:
            output += "<p>%s loaded with a status %s and a length of %s</p>" % (
                resp["url"], resp["resp"].status, len(resp["html"])
            )

    return output

if __name__ == "__main__":
    app.run()