如何限制某些属性从外部更改，但要保存python中的验证

发布于 2025-01-30 04:47:39 字数 675 浏览 2 评论 0原文

class Town:
     
    def __init__(self, name: str, country: str, population: int):

        #assert len(name) > 1, "The name of the town must be at least two characters long"
        self.name = name
        self.county = country
        self.population = population

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

    @name.setter
    def name(self,value):
        if len(value) < 2 or len(value) > 50:
            raise ValueError("The Name of the town must be between 2 and 50 characters")
        self.__name = value

例如，我想限制要从外部更改的名称属性。现在，使用此名称。如果我删除了此设置器，它将按照我的意愿工作，但是我会放宽我在设置器中进行的验证。什么是最好的方法来对我的名称属性进行验证，但不要从外部更改

原文

class Town:
     
    def __init__(self, name: str, country: str, population: int):

        #assert len(name) > 1, "The name of the town must be at least two characters long"
        self.name = name
        self.county = country
        self.population = population

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

    @name.setter
    def name(self,value):
        if len(value) < 2 or len(value) > 50:
            raise ValueError("The Name of the town must be between 2 and 50 characters")
        self.__name = value

For example I want to restrict the name attribute to be changed from the outside. Now it is possible with this name.setter. If i remove this setter it will work as I want but I will loose validations that I was made in the setter. What is the best way to keep aplying my validations for name attribute but not to be changed from the outside

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

数理化全能战士 2025-02-06 04:47:39

听起来您想设置一个名称，然后使其不可变。因此，在__ Init __中准确地执行此操作，然后删除设置器：

class Town:
    def __init__(self, name: str, country: str, population: int):
        if len(name) < 2 or len(name) > 50:
            raise ValueError("The Name of the town must be between 2 and 50 characters")

        self.__name = name
        self.county = country
        self.population = population

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

如果您希望以某种方式内部修改它，请使用私有方法将其设置为：

class Town:
    def __init__(self, name: str, country: str, population: int):
        self.__set_name(name)
        self.county = country
        self.population = population

    def __set_name(self, value):
        if len(value) < 2 or len(value) > 50:
            raise ValueError("The Name of the town must be between 2 and 50 characters")
        self.__name = value

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

It sounds like you want to set the name once, and then make it immutable. So do exactly that in __init__ and remove the setter:

class Town:
    def __init__(self, name: str, country: str, population: int):
        if len(name) < 2 or len(name) > 50:
            raise ValueError("The Name of the town must be between 2 and 50 characters")

        self.__name = name
        self.county = country
        self.population = population

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

If you want it to be internally modifiable somehow, use a private method to set it:

class Town:
    def __init__(self, name: str, country: str, population: int):
        self.__set_name(name)
        self.county = country
        self.population = population

    def __set_name(self, value):
        if len(value) < 2 or len(value) > 50:
            raise ValueError("The Name of the town must be between 2 and 50 characters")
        self.__name = value

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

回复收藏 0 原文

~没有更多了~