greatest-n-per-group

Pandas get topmost n records within each group Question: Suppose I have pandas DataFrame like this: df = pd.DataFrame({‘id’:[1,1,1,2,2,2,2,3,4], ‘value’:[1,2,3,1,2,3,4,1,1]}) which looks like: id value 0 1 1 1 1 2 2 1 3 3 2 1 4 2 2 5 2 3 6 2 4 7 3 1 8 4 1 I want to …

Django Query That Get Most Recent Objects From Different Categories Question: I have two models A and B. All B objects have a foreign key to an A object. Given a set of A objects, is there anyway to use the ORM to get a set of B objects containing the most recent object created …