小编use*_*240的帖子

我在看import asyncio: Learn Python's AsyncIO #3 - Using Coroutines。老师举了以下例子：

import asyncio
import datetime

async def keep_printing(name):
    while True:
        print(name, end=" ")
        print(datetime.datetime.now())
        await asyncio.sleep(0.5)

async def main():
    group_task = asyncio.gather(
                     keep_printing("First"),
                     keep_printing("Second"),
                     keep_printing("Third")
                 )
    try:
        await asyncio.wait_for(group_task, 3)
    except asyncio.TimeoutError:
        print("Time's up!")


if __name__ == "__main__":
    asyncio.run(main())

输出有一个异常：

First 2020-08-11 14:53:12.079830
Second 2020-08-11 14:53:12.079830
Third 2020-08-11 14:53:12.080828 
First 2020-08-11 14:53:12.580865
Second 2020-08-11 14:53:12.580865
Third 2020-08-11 14:53:12.581901 
First 2020-08-11 14:53:13.081979
Second 2020-08-11 14:53:13.082408
Third 2020-08-11 14:53:13.082408 
First 2020-08-11 14:53:13.583497 …