Iterate over data and sum

[perfringo]

The existing datastructure (dataset?) and the objective is somewhat unclear for me, but if I would have had file named 'count_data.txt' with following content:

Output:
Name,count
abc,1
ABC,2
Abc,1
abc,5
ABC,1

I would just simple brute-force:

with open('count_data.txt', 'r') as f:
    data = list(DictReader(f.readlines()))
    unique = {row['Name'] for row in data}
    for name in unique:
        print(f'{name}: {sum(int(row["count"]) for row in data if row["Name"] == name)}')

which will give:

Output:
Abc: 1
ABC: 3
abc: 6

As 'data' is list of dictionaries one can use list comprehension for whatever filtering/subtotaling needed.