How to make a category inside a category with python?

I want to build an app that manages your photos into categories and you only put at first their path and then with keywords you access those photos. I got stuck when I have to make a sub category. I tried

path_and_image = {user_answer : new_list, new_list : path_LiL}

Where user_answer is the main category, new_list is the sub category/categories and path_LiL is their paths. It gave me traceback with TypeError: unhashable type: 'list'. I do not know how to solve this, I hope someone can get my problem solved.

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