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What are Python coroutines and how are they useful?

Expert Python
Quick Answer Coroutines are async functions (async def) that can pause at await points without blocking. Unlike threads, coroutines cooperatively yield control. They're more memory efficient (no thread stack) and easier to reason about (explicit yield points). Useful for: concurrent API calls, database queries, file I/O where waiting is the bottleneck. Use asyncio.gather() to run multiple coroutines concurrently.

Answer

Coroutines can pause and resume execution.
Ideal for high-latency operations without blocking the thread.
Used in scalable servers and data pipelines.
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