8/6/2023 0 Comments Carla johnsonOn Windows, max_workers must be less than or equal to 61. If max_workers is less than or equal to 0, then a ValueError ![]() Given, it will default to the number of processors on the machine. ![]() ProcessPoolExecutor ( max_workers = None, mp_context = None, initializer = None, initargs = (), max_tasks_per_child = None ) ¶Īn Executor subclass that executes calls asynchronously using a pool ProcessPoolExecutor 는 multiprocessing 모듈을 사용합니다. result () except Exception as exc : print ( ' %r generated an exception: %s ' % ( url, exc )) else : print ( ' %r page is %d bytes' % ( url, len ( data ))) ProcessPoolExecutor ¶ as_completed ( future_to_url ): url = future_to_url try : data = future. ThreadPoolExecutor ( max_workers = 5 ) as executor : # Start the load operations and mark each future with its URL future_to_url = for future in concurrent. read () # We can use a with statement to ensure threads are cleaned up promptly with concurrent. urlopen ( url, timeout = timeout ) as conn : return conn. Import concurrent.futures import urllib.request URLS = # Retrieve a single page and report the URL and contents def load_url ( url, timeout ): with urllib. That ThreadPoolExecutor not be used for long-running tasks. This meansĮxceptions in the main thread must be caught and handled in order to ![]() Note that the exit handler which does this isĮxecuted before any exit handlers added using atexit. 최대 max_workers 스레드의 풀을 사용하여 호출을 비동기적으로 실행하는 Executor 서브 클래스.Īll threads enqueued to ThreadPoolExecutor will be joined before the ThreadPoolExecutor ( max_workers = None, thread_name_prefix = '', initializer = None, initargs = () ) ¶ submit ( wait_on_future ) class concurrent.futures. result ()) executor = ThreadPoolExecutor ( max_workers = 1 ) executor. submit ( pow, 5, 2 ) # This will never complete because there is only one worker thread and # it is executing this function.
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