Python Asyncio
Concurrent I/O with async/await, tasks, and timeouts.
- python asyncio
- async await
- asyncio.gather
- httpx async
- coroutine
Python Asyncio
Concurrent I/O with async/await, tasks, and timeouts.
Commands
| Command | What it does |
|---|---|
async def fetch(url): ... | Coroutine definition |
await asyncio.gather(a(), b()) | Run concurrently |
asyncio.run(main()) | Entry point (runs the loop) |
async with httpx client | Async HTTP session |
asyncio wait_for timeout 5 | Bounded wait |
Example
import asyncio
async def main():
await asyncio.gather(ping("a"), ping("b"))
asyncio.run(main())FAQ
asyncio vs threads?
Asyncio wins for many I/O-bound waits in one thread; threads (or processes) suit CPU work and blocking libs.
Can I call blocking code in async?
Offload with asyncio.to_thread, or it stalls the whole event loop.
常見問題
asyncio vs threads?
Asyncio wins for many I/O-bound waits in one thread; threads (or processes) suit CPU work and blocking libs.
Can I call blocking code in async?
Offload with asyncio.to_thread, or it stalls the whole event loop.
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