import aiofiles
import asyncio

async def fun1():
    async with aiofiles.open('1.text',mode='r') as f:
        async for line in f:
            print(line)

async def fun2():
    async with aiofiles.open('1.text',mode='a') as f:
        f.write('fuck u!!')
        print('写入完成')


asyncio.run(fun1())
asyncio.run(fun2())