使用`property`修饰器修改实例变量

class Person:
    def __init__(self, name, age):
        self._name = name
        self._age = age

    @property
    def name(self):
        """Getter for name property."""
        return self._name

    @name.setter
    def name(self, value):
        """Setter for name property."""
        if not isinstance(value, str):
            raise ValueError("Name must be a string")
        self._name = value

    @property
    def age(self):
        """Getter for age property."""
        return self._age

    @age.setter
    def age(self, value):
        """Setter for age property."""
        if not isinstance(value, int) or value < 0:
            raise ValueError("Age must be a non-negative integer")
        self._age = value

    @age.deleter
    def age(self):
        """Deleter for age property."""
        del self._age

# 使用示例
person = Person("Alice", 30)
print(person.name)  # 输出: Alice
person.name = "Bob"
print(person.name)  # 输出: Bob

try:
    person.age = -5  # 这将引发 ValueError
except ValueError as e:
    print(e)  # 输出: Age must be a non-negative integer

del person.age
try:
    print(person.age)  # 这将引发 AttributeError
except AttributeError as e:
    print(e)  # 输出: 'Person' object has no attribute '_age'