python，字典嵌套循环遍历合并问题

Question

python;字典嵌套：像循环字典内字典的值，并根据内部字典相同的key，把values相加；可能说的有点模糊 ，直接上代码和图：
这是代码：

all_guests = {'Alice': {'apples': 5, 'pretzels': 12},
              'Bob': {'applse': 2, 'han sandwiches': 3},
              'Carol': {'cups': 3, 'apples pie': 1}}


def total_brought(guests,item):
    num_brought = 0
    for k, v in guests.items():
        num_brought = num_brought + v.get(item,0)
    return num_brought
print('带的东西数量:')

for k, v in all_guests.items():
    # print(k)
    # print(v)
    for k1, v1 in v.items():
        print(k1 + '----:' + str(total_brought(all_guests, k1)))

图片;

我希望结果是apples可以相互合并：aplles的数量为7，而不是打印两个apples
谢谢大家！！

Answer 1

new_dict = {}

all_guests = {'Alice': {'apples': 5, 'pretzels': 12},
              'Bob': {'applse': 2, 'han sandwiches': 3},
              'Carol': {'cups': 3, 'apples pie': 1}}

for item in all_guests.values():
    for k,v in item.items():
        #判断k在不在新的字典里面，如果在，就把现在的值和里面的值相加
        if k in new_dict.keys():
            v += new_dict.get(k)
        else:
            # 如果不在就直接赋值
            new_dict[k] = v


print('带的东西数量:')
for name,num in new_dict.items():
    print(f'{name}----:{num}')