Asynchronous Programming with async and await

asyncio runs many I/O tasks concurrently in one thread using coroutines.

Intermediate

import asyncio

async def poll(sensor, delay):
    await asyncio.sleep(delay)       # yields control while waiting
    return f"{sensor} ok"

async def main():
    results = await asyncio.gather(poll("temp", 1), poll("light", 1))
    print(results)                   # both finish after ~1 s, not 2 s

asyncio.run(main())

Ideal for network servers, scrapers and IoT gateways with many slow connections. Never call blocking functions inside async code.

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