Python-访问类的受保护成员_ [英] Python - Access to a protected member _ of a class

问题描述

给出一个包含一些受保护成员的类，并使用一个公共接口对其进行修改，通常什么时候可以直接访问受保护成员?我想到了一些具体的例子:

Given a class with some protected members and a public interface to modify them, when is it generally accepted to access the protected members directly? I have some specific examples in mind:

1. 单元测试
2. 内部私有方法(例如__add__或__cmp__)访问其他受保护的属性
3. 递归数据结构(例如，访问链表中的next._data)

我不想公开这些属性，因为我不想公开地触摸它们.我的语法IDE语法高亮显示，我一直在错误地访问受保护的成员-谁在这里?

I don't want to make these attributes public as I don't want them touched publicly. My syntax IDE syntax highlighting keeps saying that I'm wrong with accessing protected members - who is right here?

编辑-在下面添加一个简单示例:

EDIT - adding a simple example below:

class Complex:
    def __init__(self, imaginary, base):
        self._imaginary = imaginary
        self._base = base

    def __str__(self):
        return "%fi + %f" % self._base, self._imaginary

    def __add__(self, other):
        return Complex(self._imaginary + other._imaginary, self._base + other._base)

Pycharm使用以下内容突出显示 other._imaginary 和 other._base :

Pycharm highlights other._imaginary and other._base with the following:

访问类的受保护成员_imaginary

Access to a protected member _imaginary of a class

推荐答案

已解决-问题实际上与缺乏类型提示有关.现在可以使用以下内容:

Solved - the problem was actually to do with lack of type-hinting. The below now works:

class Complex:
    def __init__(self, imaginary, base):
        self._imaginary = imaginary
        self._base = base

    def __str__(self):
        return "%fi + %f" % self._base, self._imaginary

    def __add__(self, other):
        """
        :type other: Complex
        :rtype Complex:
        """
        return Complex(self._imaginary + other._imaginary, self._base + other._base)

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