使用asyncio模块处理文件报错

错误：ValueError: too many file descriptors in select()

解决方案：

1. 加并发限制semaphore = asyncio.Semaphore(200)，但是只能针对爬虫调接口

   semaphore = asyncio.Semaphore(100)
   async with semaphore:
       async with aiohttp.ClientSession() as session:
           async with session.post(url, data=data, headers=header) as res:
               if int(res.status) == 200:
                   text = await res.json(encoding="utf-8")
                   print(text)
                   return text
   

2. 出现这个问题是因为千级文件操作，使用ProactorEventLoop，适用于windows io操作过多的情况，问题解决

   from asyncio import ProactorEventLoop
   asyncio.set_event_loop(ProactorEventLoop())
   loop = asyncio.get_event_loop()
   

   # 源码
   if sys.platform == 'win32':
       ProactorEventLoop: Type[AbstractEventLoop]