python

SQLAlchemy session transaction already rolled back

sqlalchemy\.exc\.InvalidRequestError: This Session's transaction has been rolled back

Fixes

1.Call session.rollback() explicitly before retrying
2.Use session.begin() context manager for automatic rollback on exception
3.Create a new session after a failed transaction

sqlalchemysession

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