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[Pedroski55]

Maybe you could give a simple example, for those of us less familiar with your objective than yourself, say 9 images, 3 categories and 3 subcategories and how you want to add data.

That way, things would be clearer and help, well, nearer.

If this is a "How can I dynamically generate variables?" question, recently, it seems to me, that issue is raised a lot. Python don't do that.

Advice: use PHP (in combination with MySQL)