python

Executor shutdown prevents new task scheduling

RuntimeError: cannot schedule new futures after shutdown

Fixes

1.Ensure all tasks are submitted before calling executor.shutdown()
2.Use 'with' context manager for ThreadPoolExecutor
3.Set wait=True in shutdown() to wait for pending futures

asyncioexecutor

Related Errors

Asyncio event loop already running

RuntimeError: This event loop is already running

•Use nest_asyncio.apply() to allow nested event loops
•Use asyncio.run_coroutine_threadsafe() instead of asyncio.run()

Coroutine never awaited

RuntimeWarning: coroutine '.*' was never awaited

•Add 'await' before the coroutine call
•Use asyncio.create_task() to schedule the coroutine

Asyncio task was cancelled

asyncio\.CancelledError

•Handle CancelledError in try/except within the task
•Use asyncio.shield() to protect critical sections from cancellation