Problems running the file in the `examples`

[HaomiaoPan]

Hello, I am a beginner. When I reproduced the code in the expamles directory, I encountered such a problem. I copied exactly the code in the SQLAlchemy.py but this is the result I got. obviously it's not right.

And here's my working version: I don't know what's wrong, so I came here to ask for help. Thank you very much。