定义一个函数，实现两个字典(所有value都为数值型)的相加，不同的key对应的值保留，相同的key对应的值相加后保留。如:

dict_ a={"a":1, "b":2, "c":3, "d":4}

dict_ b= {"b":3, "d":5, "e":7, "m":9}

结果为:

dict_ c= {"a":1, "b":5, "c":3, "d":9, "e":7, "m":9}

dict_a = {"a": 1, "b": 2, "c": 3, "d": 4}
dict_b = {"b": 3, "d": 5, "e": 7, "m": 9}
dict_c = dict_a
for k, v in dict_b.items():
    if dict_c.get(k):
        dict_c[k] += v
    else:
        dict_c[k] = v
print(dict_c)

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dict_a = {"a": 1, "b": 2, "c": 3, "d": 4}
dict_b = {"b": 3, "d": 5, "e": 7, "m": 9}

d_c = {
    **dict_a,
    **dict_b
}

for item in d_c.keys():
    if item in dict_a and item in dict_b:
        d_c[item] = dict_a[item] + dict_b[item]

print(d_c)