asyncio_test_http.py

import requests

import asyncio
import aiohttp
import aiofiles


get_img_url = lambda i: 'https://cdn.discordapp.com/embed/avatars/' + str(i) + '.png'

def download_all_sync():

    for i in range(5):
        with requests.get(get_img_url(i)) as resp:
            with open(str(i) + '.png', 'wb') as file:
                file.write(resp.content)


async def download_all_async():

    async def download_one(i):

        async with aiohttp.ClientSession() as session:
            async with session.get(get_img_url(i)) as resp:
                async with aiofiles.open(str(i) + '.png', 'wb') as file:
                    await file.write(await resp.read())

    await asyncio.wait([asyncio.ensure_future(download_one(i)) for i in range(5)])


# download_all_sync()

asyncio.get_event_loop().run_until_complete(download_all_async())  # pre-3.7
# asyncio.run(download_all_async())  # Python 3.7+