具有公共getter和private setter的Python属性 [英] Python property with public getter and private setter

问题描述

我有一个像这样的python属性:

I have a python property like this:

class Foo:

    @property
    def maxInputs(self):
        return self._persistentMaxInputs.value

    @maxInputs.setter
    def maxInputs(self, value):
        self._persistentMaxInputs.value = value

当前，每个人都可以获取和设置maxInputs的值.

Currently, the value of maxInputs can be get and set by everyone.

但是，我希望所有人都可以获取maxInputs的值，但只能在Foo类的内部进行设置.

However, I want to allow everyone to get the value of the maxInputs, but it should only be set inside of the Foo class.

那么有没有办法用一个私有的setter和一个public的getter声明一个属性?

So is there a way to declare a property with a private setter and a public getter?

推荐答案

Python没有没有隐私模型.使用下划线只是一个约定，没有访问控制. 如果您不希望'public'API包含sett，则只需从类中删除setter并直接在类代码中将其分配给self._persistentMaxInputs.value即可.如果您想限制需要记住的位置数量，可以将其设为功能:

Python has no privacy model. Using underscores is only a convention, there is no access control. If you don't want the 'public' API to include a sett, then just remove the setter from your class and assign to self._persistentMaxInputs.value in your class code directly. You can make it a function if you want to limit the number of locations that need to remember this:

def _setMaxInputs(self, value):
    self._persistentMaxInputs.value = value

您当然可以将其设为单独的property对象，但是随后您必须放弃装饰器语法:

You can of course make that a separate property object, but then you'd have to forgo the decorator syntax:

def _maxInputs(self, value):
    self._persistentMaxInputs.value = value
_maxInputs = property(None, _maxInputs)

，但现在至少您可以在类代码中使用self._maxInputs = value.但是，这实际上并没有提供太大的语法改进.

but now at least you can use self._maxInputs = value in your class code. This doesn't really offer that much of a syntax improvement however.

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