[Python-ideas] Updated PEP 428 (pathlib)

[Serhiy Storchaka]

On 05.03.13 09:23, Antoine Pitrou wrote:
> On Tue, 05 Mar 2013 00:33:48 +0100
> Jan Kaliszewski <zuo at chopin.edu.pl> wrote:
>> 1. Ad:
>>       >>> PurePosixPath('/usr/bin/python').relative('/etc')
>>       Traceback (most recent call last):
>>         ...
>>       ValueError: ...
>>
>> Shouldn't this particular operation return
>> "PurePosixPath('/etc/../usr/bin/python')"?
>
> Think what happens if /etc is a symlink to /var/etc.
> (not very likely to happen for /etc, but likely to happen in the
> general case)

posixpath.relpath('/usr/bin/python', '/etc') returns 
'../usr/bin/python'. Perhaps pathlib should have an option to provide 
such compatible behavior.

P.S. Pathlib implementation has relative_to() method. relative() method 
exists too but looks as unrelated.