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                用asyncio提供的`@asyncio.coroutine`可以把一個generator標記為coroutine類型,然后在coroutine內部用yield from調用另一個coroutine實現異步操作。 為了簡化并更好地標識異步IO,從Python 3.5開始引入了新的語法async和await,可以讓coroutine的代碼更簡潔易讀。 請注意,async和await是針對coroutine的新語法,要使用新的語法,只需要做兩步簡單的替換: 把`@asyncio.coroutine`替換為async; 把yield from替換為await。 讓我們對比一下上一節的代碼: ~~~ @asyncio.coroutine def hello(): print("Hello world!") r = yield from asyncio.sleep(1) print("Hello again!") ~~~ 用新語法重新編寫如下: ~~~ async def hello(): print("Hello world!") r = await asyncio.sleep(1) print("Hello again!") ~~~ 剩下的代碼保持不變。
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