无法设置characters类的text属性

class Characters:
    def __init__(self):
        self.text = ""  # 公共属性，可以直接访问和修改

class Characters:
    def __init__(self):
        self.__text = ""  # 私有属性

    @property
    def text(self):
        return self.__text

    @text.setter
    def text(self, value):
        if isinstance(value, str):
            self.__text = value
        else:
            raise ValueError("text must be a string")

class Characters:
    def __init__(self):
        self.__text = ""

    @property
    def text(self):
        return self.__text

    @text.setter
    def text(self, value):
        if isinstance(value, str):
            self.__text = value
        else:
            raise ValueError("text must be a string")

# 使用示例
char = Characters()
char.text = "Hello, World!"  # 正常设置
print(char.text)  # 输出: Hello, World!

try:
    char.text = 123  # 尝试设置非字符串值，将引发异常
except ValueError as e:
    print(e)  # 输出: text must be a string