如果两个字典的键匹配，如何在对其值执行加法操作时合并合并两个字典？

def merge_dicts(dict1, dict2):
    merged_dict = dict1.copy()
    for key, value in dict2.items():
        if key in merged_dict:
            merged_dict[key] += value
        else:
            merged_dict[key] = value
    return merged_dict

dict1 = {'a': 1, 'b': 2, 'c': 3}
dict2 = {'b': 4, 'c': 5, 'd': 6}

merged_dict = merge_dicts(dict1, dict2)
print(merged_dict)

{'a': 1, 'b': 6, 'c': 8, 'd': 6}