Recommended data structure/ implementation

[Mike D]

I have a simple requirement: A user belongs to groups and groups contain
items.

Based on user/group I want to display items.
Based on user I want to display groups.

What would be the best method of implementing this? A dictionary of objects?

I'd usually just use a database but I feel it's quite unnessacary and its a
scenario I'd like to know the solution for.

Hints/ Tips/ Advice appreciated :)
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