如何在我的班级中实现前后递增/递减运算符？

class Student:
    def __init__(self, name, number):
        self.name = name
        self.number = number

    def __str__(self):
        return f"Student: {self.name}, Number: {self.number}"

    def __repr__(self):
        return self.__str__()

    def __add__(self, other):
        if isinstance(other, int):
            return Student(self.name, self.number + other)
        else:
            raise TypeError("Unsupported operand type for +")

    def __sub__(self, other):
        if isinstance(other, int):
            return Student(self.name, self.number - other)
        else:
            raise TypeError("Unsupported operand type for -")

    def __iadd__(self, other):
        if isinstance(other, int):
            self.number += other
            return self
        else:
            raise TypeError("Unsupported operand type for +=")

    def __isub__(self, other):
        if isinstance(other, int):
            self.number -= other
            return self
        else:
            raise TypeError("Unsupported operand type for -=")

# 创建学生对象
student1 = Student("张三", 1)
student2 = Student("李四", 2)

# 前递增运算符
student1 += 1
print(student1)  # 输出: Student: 张三, Number: 2

# 后递增运算符
student2 = student2 + 1
print(student2)  # 输出: Student: 李四, Number: 3

# 前递减运算符
student1 -= 1
print(student1)  # 输出: Student: 张三, Number: 1

# 后递减运算符
student2 = student2 - 1
print(student2)  # 输出: Student: 李四, Number: 2