 cannot be called from a running event loop的解决方法)
# Run the agent
asyncio.run(main())
报错：
asyncio.run() cannot be called from a running event loop
import nest_asyncio
import asyncio
nest_asyncio.apply()
await main()
另外关于python async的介绍：
https://docs.llamaindex.org.cn/en/stable/getting_started/async_python/