If the user doesn't enter the exact string 'art' or the exact string 'space' then they must restart the program to try again.
Remember that the program should work if there are more available topics, and the user should be able to choose between all available topics stored in the data structure.
It's not clear what the user should enter here.
https://github.com/claraj/quiz/blob/3396e75edc65a35a58df17705207b56a633a91a6/quiz.py#L5
If the user doesn't enter the exact string 'art' or the exact string 'space' then they must restart the program to try again.
Remember that the program should work if there are more available topics, and the user should be able to choose between all available topics stored in the data structure.