Sum of values from nested dictionary

December 6, 2021

I have this nested dictionary:

{'rekless': {'C': 2.0, 'H': 4.0, 'J': 0.0}, 'bwipo': {'C': 3.0, 'D': 4.0, 'H': 0.0}, 'wunder': {'D': 10.0, 'G': 20.0, 'H': 0.50}, 'caps': {'D': 3.1, 'I': 2.0, '9J': 1.0, '10K': 2.0}, 'jankos': {'D': 3.2, 'I': 2.0, 'J': 1.0, 'K': 2.0} }

Want i want to do is to loop through it and sum all values of the "C, H, J,", etc…
So like, ‘C’ is going to be (2.0 + 3.0), ‘D’ is going to be (4.0 + 10.0 + 3.1 + 3.2).

So i can end up with something similar to this:

{ C: 'sum of values from c', D: 'sum of values from d', etc.. }

It doesnt need to be in a dictionary the final result.

Any ideias on how to start?

>Solution :

You need to loop through both dictionary and subdictionary:

d = {
    'rekless': {'C': 2.0, 'H': 4.0, 'J': 0.0},
    'bwipo': {'C': 3.0, 'D': 4.0, 'H': 0.0},
    'wunder': {'D': 10.0, 'G': 20.0, 'H': 0.50},
    'caps': {'D': 3.1, 'I': 2.0, '9J': 1.0, '10K': 2.0},
    'jankos': {'D': 3.2, 'I': 2.0, 'J': 1.0, 'K': 2.0}
}

summary = dict()
for key, subdict in d.items():
    for k, v in subdict.items():
        summary[k] = summary.get(k, 0) + v

print(summary)