Subclass `pathlib.Path` fails

Question

I would like to enhance the class pathlib.Path but the simple example above dose not work.

from pathlib import Path

class PPath(Path):
    def          


        

Answer 1

Here is the definition of the Path class. It does something rather clever. Rather than directly returning an instance of Path from its __new__(), it returns an instance of a subclass, but only if it's been invoked directly as Path() (and not as a subclass).

Otherwise, it expects to have been invoked via either WindowsPath() or PosixPath(), which both provide a _flavour class attribute via multiple inheritance. You must also provide this attribute when subclassing. You'll probably need to instantiate and/or subclass the _Flavour class to do this. This is not a supported part of the API, so your code might break in a future version of Python.

TL;DR: This idea is fraught with peril, and I fear that my answers to your questions will be interpreted as approval rather than reluctant assistance.