[Python-ideas] os.path.commonpath()

David Townshend aquavitae69 at gmail.com
Wed Nov 7 06:59:49 CET 2012

This seems to be overlapping quite a lot with the recent discussion on
object-oriented paths (
http://mail.python.org/pipermail/python-ideas/2012-October/016338.html) and
this question of how paths are represented on different systems was
discussed quite extensively.  I'm not sure where the thread left off, but
if PEP 428 is still going ahead then maybe this is something that should be
brought into it.


On Wed, Nov 7, 2012 at 7:15 AM, Greg Ewing <greg.ewing at canterbury.ac.nz>wrote:

> Bruce Leban wrote:
>  If you change the semantics so that it either (1) it always always
>> includes a trailing / or (2) it includes a trailing slash if the two paths
>> have it in common, then you don't have the weirdness that in this case it
>> returns a slash and in others it doesn't. I am slightly inclined to (1) at
>> this point.
> But then the common prefix of "/a/b" and "/a/c" would be "/a/",
> which would be very unexpected -- usually the dirname of a path is
> not considered to include a trailing slash.
> The special treatment of the root directory is no weirder than it
> is anywhere else. It's already special, since in unix it's the
> only case where a trailing slash is semantically significant.
> (To the kernel, at least -- a few command line utilities break this
> rule, but they're screwy.)
> --
> Greg
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