code: def QA_util_sql_async_mongo_setting(uri='mongodb://localhost:27017/quantaxis'):
      
      # loop = asyncio.new_event_loop()
      # asyncio.set_event_loop(loop)
      try:
          loop = asyncio.get_event_loop()
      except RuntimeError:
          loop = asyncio.new_event_loop()
          asyncio.set_event_loop(loop)
  
      # async def client():
      return AsyncIOMotorClient(uri, io_loop=loop)
docs: 异步mongo示例
  
      Keyword Arguments:
          uri {str} -- [description] (default: {'mongodb://localhost:27017/quantaxis'})
  
      Returns:
          [type] -- [description]