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Tue Dec 30 02:02:07 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-December/084636.html

You know, all this path separator and list complication isn't really 
necessary, when you can just take the os.path.dirname() of the return 
from commonprefix().

Perhaps we could just add that recommendation to the docs?

At 04:46 PM 12/29/2008 -0600, skip at pobox.com wrote:

>     Jeff> For those that prefer not to add functions all willy-nilly, would
>     Jeff> it not be better to add a "delimiter" keyword that defaults to
>     Jeff> False? Then "delimiter=False" will function with the current
>     Jeff> functionality unchanged while
>
>     Jeff> os.path.commonprefix(["bob/export/home", 
> "bob/etc/passwd"], delimiter = "/")
>
>     Jeff> would properly return
>
>     Jeff> 'bob/'
>
>On Windows what would you do with this crazy, but valid, path?
>
>     c:/etc\\passwd
>
>I don't do Windows, so don't have any idea if there is even an /etc/passwd
>file on Windows.  I'd guess not, but that's not the point.  The point is
>that you can use both / (aka ntpath.sep) and \ (aka ntpath.altsep) in
>Windows pathnames.  See my patch (issue 4755) for a version of
>os.path.<whatever> which works as at least I expect and should work
>cross-platform.
>
>Skip
>
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[Python-Dev] A wart which should have been repaired in 3.0?