[Python-Dev] pathlib (PEP 428) status

[Nick Coghlan]

On 24 October 2013 18:17, Antoine Pitrou <solipsis at pitrou.net> wrote:
> Le Thu, 24 Oct 2013 00:38:02 +0200,
> Christian Heimes <christian at python.org> a écrit :
>> Am 23.10.2013 23:37, schrieb Charles-François Natali:
>> > Hi,
>> >
>> > What's the current status of pathlib? Is it targeted for 3.4?
>> >
>> > It would be a really nice addition, and AFAICT it has already been
>> > maturing a while on pypi, and discussed several times here.
>> > If I remember correctly, the only remaining issue was stat()'s
>> > result caching.
>>
>> Hi,
>>
>> I'd like to see pathlib in 3.4 as well. Last week at PyCon.DE in
>> Cologne several people have asked me about pathlib. We even had a
>> BarCamp session about path libraries for Python. A couple of German
>> Python users have promised to contribute doc improvements soonish.
>>
>> AFAIK stat caching and a os.listdir() generator with stat `recycling`
>> (dirent->d_type) are open issues. I suggest Python 3.4 should ignore
>> these features for now but prepare the API and documentation for
>> future enhancements.
>
> Thanks for the push. I have to cleanup / remove stat caching from the
> PEP (not sure yet which one, Nick expressed interest during the last
> discussion) and then polish it for pronouncement.

A clean stat caching mechanism would potentially help resolve an
architectural problem with walkdir
(https://pypi.python.org/pypi/walkdir), where offering stat-based
filtering as a pipeline of independent iterators would significantly
increase the number of stat calls compared to doing such filtering
directly outside the iterator.

However, since walkdir doesn't currently offer such stat-based
filters, and it's unlikely I'll be adding it any time soon, deferring
a stat caching design sounds like a reasonable idea to me.

> Still, I need to find someone to pronounce on it.

I'd offer, but I already have a scary number of things I need to get
done by beta 1 :P

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia