[Python-Dev] Defining a path protocol

Chris Barker chris.barker at noaa.gov
Thu Apr 7 12:56:21 EDT 2016

On Thu, Apr 7, 2016 at 12:00 AM, INADA Naoki <songofacandy at gmail.com> wrote:

> I feel adding protocol only for path is bit over engineering. So I'm -0.5
> on adding __fspath__.
> I'm +1 on adding general protocol for *coerce to string* like __index__.

isn't __str__ the protocol for "coerce to string" ?

__index__ is a protocol for "coerce to an integer that can be used as an
index", which is like __fspath__ would be "coerce to a string that can be
used as a path"

the whole point is that __str__ will "work" with virtually anything --
whether it can reasonably be used as a path or not. I'm not sure that's a
problem, but if it is, then that's what this new protocol is trying to
solve, just like __Index__ enforces that only things that are intended to
be used as indexes will work.



Christopher Barker, Ph.D.

Emergency Response Division
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Chris.Barker at noaa.gov
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