非同期処理

Python 3.9.13 (pyenv) Ubuntu 20.04 (WSL2) https://github.com/aoirint/python_asyncio_examples なんかこう書くとうまく動くということしかわからん、という実装例です。 https://twitter.com/aoirint/status/1544891079786627074 基本実装 同期関数から非同期関数を同期的に呼び出す asyncio.run Details import asyncio import time def main(): async def func(): await asyncio.sleep(3) print('func exited') # 1 asyncio.run(func()) time.sleep(1) print('main exited') # 2 main() print('exited') # 3 同期関数から非同期関数を非同期的に呼び出す threading.Thread + asyncio.run Details import asyncio from concurrent.futures import ThreadPoolExecutor import threading import time def main(): async def func(): await asyncio.sleep(3) print('func exited') # 3 thread = threading.Thread(target=lambda: asyncio.run(func())) thread.start() time.sleep(1) print('main exited') # 1 main() print('exited') # 2 非同期関数から同期関数を同期的に呼び出す ふつうに呼び出す Details import asyncio import time async def main(): def func(): time.sleep(3) print('func exited') # 1 func() await asyncio.sleep(1) print('main exited') # 2 asyncio.run(main()) print('exited') # 3 非同期関数から同期関数を非同期的に呼び出す asyncio.new_event_loop + ThreadPoolExecutor + EventLoop.run_in_executor Details import asyncio from concurrent.futures import ThreadPoolExecutor import time async def main(): def func(): time.sleep(3) print('func exited') # 3 loop = asyncio.new_event_loop() executor = ThreadPoolExecutor() loop.run_in_executor(executor, func) await asyncio.sleep(1) print('main exited') # 1 asyncio.run(main()) print('exited') # 2 非同期関数から非同期関数を同期的に呼び出す awaitキーワード Details import asyncio async def main(): async def func(): await asyncio.sleep(3) print('func exited') # 1 await func() await asyncio.sleep(1) print('main exited') # 2 asyncio.run(main()) print('exited') # 3 非同期関数から非同期関数を非同期的に呼び出す threading.Thread + asyncio.run Details import asyncio import threading async def main(): async def func(): await asyncio.sleep(3) print('func exited') # 3 thread = threading.Thread(target=lambda: asyncio.run(func())) thread.start() await asyncio.sleep(1) print('main exited') # 1 asyncio.run(main()) print('exited') # 2 非同期関数から同期間数を非同期的に3つずつ呼び出す asyncio.new_event_loop + ThreadPoolExecutor + EventLoop.run_in_executor Details import asyncio from concurrent.futures import ThreadPoolExecutor import time async def main(): def func(): time.sleep(3) print('func exited') # 3 loop = asyncio.new_event_loop() executor = ThreadPoolExecutor(max_workers=3) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) loop.run_in_executor(executor, func) await asyncio.sleep(1) print('main exited') # 1 asyncio.run(main()) print('exited') # 2 よく見るエラー RuntimeError: Event loop is closed TBW ...