Type hints for `pathlib.types`

Feature or enhancement

The pathlib.types module is new in 3.14, and contains a single public class: pathlib.types.PathInfo.

This module also contains a few private classes: _PathParser, _JoinablePath, _ReadablePath and _WritablePath.

As the pathlib.types module is not imported by pathlib, I think we're free to add proper type annotations to the entire module, including the private classes. I think this will help clarify the interface.

I'd like these hints to be compatible with the oldest version of Python still receiving security updates (3.9 at time of writing) because I'm hoping to provide a PyPI package from this module.

Linked PRs

• gh-131639

首先檢查 pathlib.types 模組和連結的 PR gh-131639，以確定工作的目前狀態。檢查如何讓註解維持與 Python 3.9 的相容性，並考慮 issue 中提到的公開類別和私有類別。當該模組具備完整且相容的型別提示，同時不改變其預期介面時，即可視為完成。