![]() The current context is used when no context is provided.Ĭhanged in version 3.11: Added the context parameter. If you want the callback to be called with keywordĪn optional keyword-only context argument allows specifying a The optional positional args will be passed to the callback when Scheduled for exactly the same time, the order in which they Number of seconds (can be either an int or a float).Īn instance of asyncio.TimerHandle is returned which canĬallback will be called exactly once. Schedule callback to be called after the given delay call_later ( delay, callback, * args, context = None ) ¶ Event loop uses monotonicĬlocks to track time. ![]() To be called at some point in the future. Using partial objects is usually more convenient than using lambdas,Īs asyncio can render partial objects better in debug and errorĮvent loop provides mechanisms to schedule callback functions partial ( print, "Hello", flush = True )) # will schedule "print("Hello", flush=True)" loop. This can happen on a secondary thread when the main application is Raises RuntimeError if called on a loop that’s been closed. When scheduling callbacks fromĪnother thread, this function must be used, since call_soon() is not call_soon_threadsafe ( callback, * args, context = None ) ¶Ī thread-safe variant of call_soon(). Unlike call_soon_threadsafe(), this method is not thread-safe. The optional keyword-only context argument specifies aĬustom contextvars.Context for the callback to run in.Ĭallbacks use the current context when no context is provided. Which can be used later to cancel the callback.Ĭallbacks are called in the order in which they are registered.Įach callback will be called exactly once. Schedule the callback callback to be called withĪrgs arguments at the next iteration of the event loop. call_soon ( callback, * args, context = None ) ¶ Note that there is no need to call this function when This should be used to reliably finalize all scheduled The event loop will issue a warning if a new asynchronous generator Schedule all currently open asynchronous generator objects toĬlose with an aclose() call. Should be called after the event loop is closed. This method is idempotent and irreversible. This method clears all queues and shuts down the executor, but does The loop must not be running when this function is called. Return True if the event loop was closed. Return True if the event loop is currently running. Note that new callbacks scheduled by callbacks will not run in thisĬase instead, they will run the next time run_forever() or ![]() The loop will run the current batch of callbacks and then exit. If stop() is called while run_forever() is running, Those that were already scheduled), and then exit. Run all callbacks scheduled in response to I/O events (and The loop will poll the I/O selector once with a timeout of zero, If stop() is called before run_forever() is called, ![]() Run the event loop until stop() is called. Return the Future’s result or raise its exception. Is implicitly scheduled to run as a asyncio.Task. ![]() Run until the future (an instance of Future) has The Examples section showcases how to work with some eventĮvent loops have low-level APIs for the following:Įxecuting code in thread or process pools SelectorEventLoop and ProactorEventLoop classes The Event Loop Implementations section documents the The Server Objects section documents types returned fromĮvent loop methods like loop.create_server() Methods such as loop.call_soon() and loop.call_later() TimerHandle instances which are returned from scheduling The Callback Handles section documents the Handle and The Event Loop Methods section is the reference documentation of This documentation page contains the following sections: Note that the behaviour of get_event_loop(), set_event_loop(),Īnd new_event_loop() functions can be altered by new_event_loop ( ) ¶Ĭreate and return a new event loop object. Set loop as the current event loop for the current OS thread. In some future Python release this will become an error. In Python versions 3.10.9, 3.11.1 and 3.12 they emit aĭeprecationWarning if there is no running event loop and no (and other functions which use it implicitly) emitted aĭeprecationWarning if there was no running event loop, even if ![]()
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