Async Programming
Async Best Practices
Avoiding common async mistakes and writing production-quality code
Interview: Backend architecture — senior level
Async Best Practices
Async code has unique pitfalls that can cause subtle bugs, deadlocks, and performance issues.
Critical Rules
- Never block the event loop: Use
run_in_executorfor blocking code - Always await coroutines: Forgetting await returns a coroutine object
- Use TaskGroup over gather: Better error propagation and cancellation
- Handle cancellation: asyncio tasks can be cancelled at any await point