如何对从属于子词典的特定关键字的所有值求和

def sum_values_of_specific_keyword(dictionary, sub_dict_key, specific_keyword):
    total_sum = 0

    if sub_dict_key in dictionary:
        sub_dict = dictionary[sub_dict_key]
        for key, value in sub_dict.items():
            if specific_keyword in key:
                total_sum += value

    return total_sum

dictionary = {
    'sub_dict1': {
        'keyword1_value1': 10,
        'keyword2_value1': 20,
        'keyword1_value2': 30,
        'keyword2_value2': 40
    },
    'sub_dict2': {
        'keyword1_value3': 50,
        'keyword2_value3': 60,
        'keyword1_value4': 70,
        'keyword2_value4': 80
    }
}

sub_dict_key = 'sub_dict1'
specific_keyword = 'keyword1'

result = sum_values_of_specific_keyword(dictionary, sub_dict_key, specific_keyword)
print(result)  # 输出：40