Coroutines and asyncio

See Typing async/await for the full detail on typing coroutines and asynchronous code.

import asyncio
 
# A coroutine is typed like a normal function
async def countdown35(tag: str, count: int) -> str:
    while count > 0:
        print('T-minus {} ({})'.format(count, tag))
        await asyncio.sleep(0.1)
        count -= 1
    return "Blastoff!"