Asyncio example: parallel execution

parallel.py

import asyncio
from time import sleep
from concurrent.futures import ThreadPoolExecutor

async def hello_world(loop, delay):
  print("hello world")
  await loop.run_in_executor(ThreadPoolExecutor(), sleep, delay)
  print("hello there")
  return "done"

loop = asyncio.get_event_loop()
try:
  coroutines = [
    hello_world(loop, 1),
    hello_world(loop, 2)
  ]
  tasks, _ = loop.run_until_complete(asyncio.wait(coroutines))
  results = list(map(lambda t: t.result(), tasks))
  print(results)
except Exception:
  # error handling
  pass
finally:
  loop.close()