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Wed Jun 15 15:15:01 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-June/145226.html

On Wed, 15 Jun 2016 at 12:12 Koos Zevenhoven <k7hoven at gmail.com> wrote:

> >>     if isinstance(filename, os.PathLike):
>
> By the way, regarding the line of code above, is there a convention
> regarding whether implementing some protocol/interface requires
> registering with (or inheriting from) the appropriate ABC for it to
> work in all situations. IOW, in this case, is it sufficient to
> implement __fspath__ to make your type pathlike? Is there a conscious
> trend towards requiring the ABC?
>

ABCs like os.PathLike can override __subclasshook__ so that registration
isn't required (see
https://hg.python.org/cpython/file/default/Lib/os.py#l1136). So
registration is definitely good to do to be explicit that you're trying to
meet an ABC, but it isn't strictly required.
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[Python-Dev] proposed os.fspath() change