嵌套字典中的Python sum值

def nested_dict_sum(nested_dict):
    total_sum = 0
    for value in nested_dict.values():
        if isinstance(value, dict):
            total_sum += nested_dict_sum(value)
        else:
            total_sum += value
    return total_sum

nested_dict = {
    'a': {
        'b': 1,
        'c': {
            'd': 2,
            'e': 3
        }
    },
    'f': {
        'g': 4,
        'h': 5
    }
}

result = nested_dict_sum(nested_dict)
print(result)