[Python-Dev] Pathlib enhancements - acceptable inputs and outputs for __fspath__ and os.fspath()

[Random832]

On Wed, Apr 13, 2016, at 10:21, Nick Coghlan wrote:
> I'd expect the main consumers to be os and os.path, and would honestly
> be surprised if we needed many explicit invocations above that layer,
> other than in pathlib itself.

I made a toy implementation to try this out, and making os.open support
it does not get you builtin open "for free" as I had suspected; builtin
open has its own type checks in _iomodule.c.

Probably anything not implemented in pure python that deals with
filenames is going to have to have its type checking revised.