python
Pydantic v2 import in v1 environment
ImportError: cannot import name 'field_validator' from 'pydantic'
Fixes
- 1.Upgrade pydantic: pip install 'pydantic>=2.0'
- 2.Use @validator instead of @field_validator for Pydantic v1
- 3.Check installed version: python -c 'import pydantic; print(pydantic.VERSION)'
pydanticversion
Related Errors
python3 fixes
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()
python3 fixes
Coroutine never awaited
RuntimeWarning: coroutine '.*' was never awaited
- •Add 'await' before the coroutine call
- •Use asyncio.create_task() to schedule the coroutine
python3 fixes
Asyncio task was cancelled
asyncio\.CancelledError
- •Handle CancelledError in try/except within the task
- •Use asyncio.shield() to protect critical sections from cancellation