Function spin

19-concurrency/spinner_async_experiment.py:11–19

(msg: str)

import time

async def spin(msg: str) -> None:
    for char in itertools.cycle(r'\|/-'):
        status = f'\r{char} {msg}'
        print(status, flush=True, end='')
        try:
            await asyncio.sleep(.1)
        except asyncio.CancelledError:
            break
    print('THIS WILL NEVER BE OUTPUT')

# tag::SPINNER_ASYNC_EXPERIMENT[]
async def slow() -> int: