如何在Python中将9和3这两个数字作为特殊数字？

class SpecialNumber:
    def __init__(self, value):
        self.value = value

    def __add__(self, other):
        if isinstance(other, SpecialNumber):
            return SpecialNumber(self.value + other.value)
        else:
            return SpecialNumber(self.value + other)

    def __sub__(self, other):
        if isinstance(other, SpecialNumber):
            return SpecialNumber(self.value - other.value)
        else:
            return SpecialNumber(self.value - other)

    def __str__(self):
        return str(self.value)


# 创建两个特殊数字对象
number1 = SpecialNumber(9)
number2 = SpecialNumber(3)

# 加法操作
result_add = number1 + number2
print(result_add)  # 输出：12

# 减法操作
result_sub = number1 - number2
print(result_sub)  # 输出：6