Feature: `__` private members/name mangling in classes

[MrApplejuice]

Sorry, I would expect that this probably documented but I just cannot find it:

https://docs.python.org/3/tutorial/classes.html?highlight=name%20mangling#private-variables

Short question: Is this supported in some way? Or are there plans to support it?

It seems to be such a core-feature of Python that I kind of feel stupid to ask, I would bet that it was decided to not implement that feature somewhere/somehow, but I cannot find a reference to that decision or if it even was made?

To me this would be a very awesome feature, because it is for me the feature that avoids naming collisions in classes for something like Class-Mixins. I am reviving an old project of mine which consists converting an old piece of Python code to a web-capable implementation, and this would make those conversion efforts a LOT more convenient.

[MrApplejuice]

Background:

class HighscoreMixin:
    pixi = None

    __my_value = 1

    def __init__(self):
        self.__my_second_value = 2
        print(list(sorted(dir(self))))

    def update_highscore(self, new_score):
        pass

Outputs:

 [..., '__my_second_value', '__my_value', ...]

Which is not name mangled.

PS: Looks like a game, but it is actually an scientific experiment.