python

Pydantic issubclass error with type annotation

TypeError: issubclass\(\) arg 1 must be a class.*Pydantic

Fixes

1.Use typing.get_origin() and typing.get_args() for generic types
2.Wrap complex annotations in Annotated[] with proper metadata
3.Use model_rebuild() after defining all referenced models

pydantictyping

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