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Wed Apr 13 16:39:42 EDT 2016 · https://mail.python.org/pipermail/python-dev/2016-April/144074.html

so are we worried that __fspath__ will exist and be callable, but  might
raise an AttributeError somewhere inside itself? if so isn't it broken
anyway, so should it be ignored?

and I know it's asking poermission rather than forgiveness, but what's
wrong with:

if hasattr(path, "__fspath__"):
    path = path.__fspath__()

if you really want to check for the existence of the attribute first?

or even:

path = path.__fspath__ if hasattr(path, "__fspath__") else path

(OK, really a Pythonic style question now....)

-CHB

On Wed, Apr 13, 2016 at 12:54 PM, Brett Cannon <brett at python.org> wrote:

>
>
> On Wed, 13 Apr 2016 at 12:39 Fred Drake <fred at fdrake.net> wrote:
>
>> On Wed, Apr 13, 2016 at 3:24 PM, Chris Angelico <rosuav at gmail.com> wrote:
>> > Is that the intention, or should the exception catching be narrower? I
>> > know it's clunky to write it in Python, but AIUI it's less so in C:
>> >
>> > try:
>> >     callme = path.__fspath__
>> > except AttributeError:
>> >     pass
>> > else:
>> >     path = callme()
>>
>> +1 for this variant; I really don't like masking errors inside the
>> __fspath__ implementation.
>>
>
> Don't read too much into the code in that gist. I just did them quickly to
> get the point across of the proposals in terms of str/bytes, not what will
> be proposed in any final patch.
>
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[Python-Dev] pathlib - current status of discussions