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Thu Apr 7 14:44:30 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-April/143775.html

On Apr 7, 2016 10:00 AM, "Chris Barker" <chris.barker at noaa.gov> wrote:
>
> 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"

No, __index__ is the protocol for "do a safe coerce to integer". The name
is misleading, but its use in non-indexing contexts is well established.
E.g.

" ab" * obj

will return a string with obj.__index__() repetitions.

-n
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[Python-Dev] Defining a path protocol