python

Pydantic v2 serialization error

pydantic.*SerializationError.*unable to serialize

Fixes

1.Add custom serializer with @field_serializer decorator
2.Use model_config = ConfigDict(arbitrary_types_allowed=True)
3.Implement __get_pydantic_core_schema__ for custom types

pydanticserialization

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