[Python-ideas] Decide if `type.__subclasses__` is part of future Python or not

Greetings, Currently `type.__subclasses__` is not documented at docs.python.org (and works in both python 2 & python 3). I would like to keep `.__subclasses__` and have it documented at docs.python.org. Is there a reason it is not documented? I realize the whole type system is going an overhaul, and the concept of what is "subclass" of another class is a complicated issue. See for example: https://github.com/python/typing/issues/135 which talks about the complexity of deciding subclassing. I think though, despite the overall, `types.__subclasses__` should be kept & documented. Thanks, Joy Diamond. 1. The google search: "site:docs.python.org __subclasses__" finds no instances of the word "__subclasses__" 2. As for what the function does, it returns the subclasses of a class: Consider the following program: class CryptographicActors(object): pass class Alice(CryptographicActors): pass class Bob(CryptographicActors): pass print("CryptographicActors subclases: %s" % CryptographicActors.__subclasses__()) help(CryptographicActors.__subclasses__) 3. It properly prints out: CryptographicActors subclases: [, ] Showing the two subclasses (`Alice` and `Bob`) 4. The internal documentation explains "__subclasses__() -> list of immediate subclasses" To fully figure out what it did, I had to read the source code to Python -- which really is not the best way to figure out what a function does; hence the request to document it (and indicate it's future existence in python)