Problem Statement
When would you choose asyncio over threads for a backend service, and what pitfalls matter?
Explanation
Choose asyncio for high-concurrency I O: many sockets, HTTP calls, or database drivers with async support. It scales with a single event loop and has low context-switch overhead.
Do not call blocking code inside async paths; offload it to a worker pool. Always await tasks or gather them; leaked tasks hide errors. For CPU-bound work, use processes or native extensions instead of the event loop.
Code Solution
SolutionRead Only
import asyncio
async def main():
await asyncio.gather(fetch(a), fetch(b))
asyncio.run(main())