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How do you handle concurrency in Python web frameworks?

Expert Python
Quick Answer Async web frameworks: FastAPI and Starlette use asyncio natively - define route handlers as async def for non-blocking I/O. Django 3.1+ supports async views and middleware. Use async DB libraries: asyncpg (PostgreSQL), motor (MongoDB), aioredis. Don't mix sync and async code carelessly - sync calls block the event loop. Use asyncio.to_thread() to run blocking code in a thread pool without blocking.

Answer

Async frameworks enable non-blocking requests.
Background workers handle long tasks.
Improves scalability and responsiveness.
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