Is there a more efficient way to sum the keys of a subdictionary than the following? for house in my_dictionary: artifact['Total']['Count'] += artifact['A']['Count'] artifact['Total']['Action'] += artifact['B']['Action'] artifact['Total']['Passive'] += artifact['C']['Passive'] I feel like there is a way to condense this, but I can't figure it out. I've written what is happening out in question form below. I came up with an answer, but I think that there is a better one out there. If I have the following dictionary my_dictionary: { "A": { "Count": 3, "Action": 3, "Passive": 0 }, "B": { "Count": 1, "Action": 0, "Passive": 1 }, "C": { "Count": 1, "Action": 1, "Passive": 0 }, "Total": { "Count": 0, "Action": 0, "Passive": 0 } Once the my_dictionary has been created (with everything in Total blank), I to populate Total where Total is a sum of each of the other fields respective keys? { "A": { "Count": 3, "Action": 3, "Passive": 0 }, "B": { "Count": 1, "Action": 0, "Passive": 1 }, "C": { "Count": 1, "Action": 1, "Passive": 0 }, "Total": { "Count": 5, "Action": 4, "Passive": 1 } Continue reading...