for dictionary in list_dictionaries:
    for key, value in dictionary.items():
        comb_dict[key] += value
return comb_dict

def union(dict_list):
    all_keys = set()
for d in dict_list:
    for k in d:
        all_keys.add(k)
for key in all_keys:
    yield key, sum(d.get(key, 0) for d in dict_list)

def f3(list_dictionaries):
    return dict(union(list_dictionaries))
Добавить элементы в список словарей