new_contents: import asyncio
  import aiomysql
  import sqlalchemy
  
  
  async def main(loop):
      engine = await aiomysql.sa.create_engine(user='dota', db='dota', host='127.0.0.1',
                                               password='123456', loop=loop)
      pass
  
  if __name__ == '__main__':
      loop = asyncio.get_event_loop()
      loop.run_until_complete(main(loop))
  
subject: 添加main.py