41 lines
1.1 KiB
Python
41 lines
1.1 KiB
Python
# spinner_async_experiment.py
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# credits: Example by Luciano Ramalho inspired by
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# Michele Simionato's multiprocessing example in the python-list:
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# https://mail.python.org/pipermail/python-list/2009-February/675659.html
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import asyncio
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import itertools
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import primes
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async def spin(msg: str) -> None:
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for char in itertools.cycle(r'\|/-'):
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status = f'\r{char} {msg}'
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print(status, flush=True, end='')
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try:
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await asyncio.sleep(.1)
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except asyncio.CancelledError:
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break
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print('THIS WILL NEVER BE OUTPUT')
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async def check(n: int) -> int:
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return primes.is_prime(n) # <4>
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async def supervisor(n: int) -> int:
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spinner = asyncio.create_task(spin('thinking!')) # <1>
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print('spinner object:', spinner) # <2>
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result = await check(n) # <3>
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spinner.cancel() # <5>
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return result
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# end::SPINNER_ASYNC_EXPERIMENT[]
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def main() -> None:
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n = 5_000_111_000_222_021
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result = asyncio.run(supervisor(n))
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msg = 'is' if result else 'is not'
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print(f'{n:,} {msg} prime')
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if __name__ == '__main__':
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main()
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