如何在python中返回不同类型的对象重载sum函数？

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

    def __add__(self, other):
        return self.value + other

def custom_sum(*args):
    result = 0
    for arg in args:
        if isinstance(arg, CustomObject):
            result += arg.value
        else:
            result += arg
    return result

# 示例用法
obj1 = CustomObject(5)
obj2 = CustomObject(10)
print(custom_sum(obj1, obj2))  # 输出：15
print(custom_sum(1, 2, 3))  # 输出：6