Python属性返回属性对象

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

    @property
    def name(self):
        return self._name

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

    @property
    def age(self):
        return self._age

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

# 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
except ValueError as e:
    print(e)  # 输出: Age must be a non-negative integer

class Person:
    # ... 其他代码 ...

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

# 使用示例
person = Person("Alice", 30)
person.name = "Bob"  # 现在可以正常修改