使用asyncio模塊處理文件報錯

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

解決方案：

1. 加併發限制semaphore = asyncio.Semaphore(200)，可是隻能針對爬蟲調接口

   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. 出現這個問題是由於千級文件操做，使用ProactorEventLoop，適用於windows io操做過多的狀況，問題解決

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

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