teratail402478補足（requestsに単純に置き換えた例）

import asyncio
import time
import requests
import aiohttp
import ramdom

async def download(url, session):
  print("download start")
  s = session.get(url)
  print("download {url} completed")
  await asyncio.sleep(0)
  sentence = s.text
  return sentence

async def text_preprocess(sentence):
  a = random.randint(0,6)
  print(f"processing for {a} sec")
  # await asyncio.sleep(a)
  return a

async def download_and_preprocess(url, session):
  sentence = await download(url, session)
  return  await text_preprocess(sentence)

async def do_tasks(urls):
    session = requests.Session()
    tasks = [asyncio.create_task(download_and_preprocess(url, session)) for url in urls]
    results = await asyncio.gather(*tasks)
    session.close()
    return results

def main():
  urls = ["https://www.example.com/domains/reserved","https://www.example.org/domains/reserved","https://www.example.edu/domains/reserved"]
  loop = asyncio.get_event_loop()
  
  results = loop.run_until_complete(do_tasks(urls))
  for r in results:
      print(f"result:{r}")
  
start = time.time()
main()
process_time = time.time() - start
print(process_time)