如何为两个抽象类创建__add__函数

from abc import ABC, abstractmethod

class AbstractClass1(ABC):
    @abstractmethod
    def __add__(self, other):
        pass

class AbstractClass2(ABC):
    @abstractmethod
    def __add__(self, other):
        pass

class ConcreteClass1(AbstractClass1):
    def __init__(self, value):
        self.value = value

    def __add__(self, other):
        if isinstance(other, ConcreteClass1):
            return ConcreteClass1(self.value + other.value)
        else:
            raise TypeError("Unsupported operand type")

class ConcreteClass2(AbstractClass2):
    def __init__(self, value):
        self.value = value

    def __add__(self, other):
        if isinstance(other, ConcreteClass2):
            return ConcreteClass2(self.value + other.value)
        else:
            raise TypeError("Unsupported operand type")

obj1 = ConcreteClass1(5)
obj2 = ConcreteClass1(10)
result = obj1 + obj2
print(result.value)  # 输出：15

obj3 = ConcreteClass2(3)
obj4 = ConcreteClass2(7)
result = obj3 + obj4
print(result.value)  # 输出：10