Samples of various asyncio patterns to understand how it works.

async_tests.py

import asyncio
from time import time

from httpx import AsyncClient


async def async_request(url: str):
    async with AsyncClient() as client:
        resp = await client.get(url)
        result = len(resp.read())
    print(url)
    return f'{url} - {result} - {resp.elapsed}'


async def sync_sample():
    print('run synchronously')
    res1 = await async_request('https://google.com')
    res2 = await async_request('https://amazon.com')
    res3 = await async_request('https://jsatt.com')
    print(res1, res2, res3)


async def create_task_sample():
    print('run concurrently using `asyncio.create_task`')
    task1 = asyncio.create_task(async_request('https://google.com'))
    task2 = asyncio.create_task(async_request('https://amazon.com'))
    task3 = asyncio.create_task(async_request('https://jsatt.com'))

    res1 = await task1
    res2 = await task2
    res3 = await task3

    print(res1, res2, res3)


async def gather_sample():
    print('run concurrently using `asyncio.gather`')
    res1, res2, res3 = await asyncio.gather(
        async_request('https://google.com'),
        async_request('https://amazon.com'),
        async_request('https://jsatt.com'),
    )

    print(res1, res2, res3)


async def runner():
    t1 = time()
    # await sync_sample()
    # await gather_sample()
    await create_task_sample()
    print(time() - t1)

loop = asyncio.get_event_loop()
loop.run_until_complete(runner())

More on asyncio

• https://realpython.com/lessons/what-asyncio/
• https://realpython.com/async-io-python/
• https://docs.python.org/3/library/asyncio-task.html