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The context argument is a dict containing the following keys: - 'message': Error message; - 'exception' (optional): Exception object; - 'future' (optional): Future instance; - 'handle' (optional): Handle instance; - 'protocol' (optional): Protocol instance; - 'transport' (optional): Transport instance; - 'socket' (optional): Socket instance; - 'asyncgen' (optional): Asynchronous generator that caused the exception. New keys maybe introduced in the future. Note: do not overload this method in an event loop subclass. For custom exception handling, use the `set_exception_handler()` method. 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This calls all currently ready callbacks, polls for I/O, schedules the resulting callbacks, and finally schedules 'call_later' callbacks. FrrNg?zpoll took %.3f ms: %s eventsg@@z$poll %.3f ms took %.3f ms: %s eventsz"poll %.3f ms took %.3f ms: timeoutzExecuting %s took %.3f seconds)"rrp_MIN_SCHEDULED_TIMER_HANDLESrj%_MIN_CANCELLED_TIMER_HANDLES_FRACTIONr6r9rheapifyheappoprorlZ_whenminmaxrsMAXIMUM_SELECT_TIMEOUTrZ _selectorZselectloggingINFODEBUGr logrrtrangepopleftr~Z_runr}rr)rXZ sched_countZ new_scheduledrZtimeoutrrrrlevelZneventZend_timeZntodoirrrrKs                       zBaseEventLoop._run_oncec Csytj}tj}Wntk r$dSXt|}|j|krsV            ;   /