[Python-Dev] A wart which should have been repaired in 3.0?

Wed Dec 31 14:21:49 CET 2008

Phillip J. Eby wrote:
> At 09:30 PM 12/30/2008 -0500, rdmurray at bitdance.com wrote:
>> On 2008年12月30日 at 17:51, Phillip J. Eby wrote:
>>> At 02:32 PM 12/30/2008 -0800, Scott David Daniels wrote:
>>>> More trouble with the "just take the dirname":
>>>>>>>> paths = ['/a/b/c', '/a/b/d', '/a/b']
>>>> os.path.dirname(os.path.commonprefix([
>>>> os.path.normpath(p) for p in paths]))
>>>> give '/a', not '/a/b'.
>>>>>> ...because that's the correct answer.
>>>> But not the answer that is wanted.
>>>> So the challenge now is to write a single expression that will yield
>> '/a/b' when passed the above paths list, and also produce '/a/b' when
>> passed the following paths list:
>>>> paths = ['/a/b/c', '/a/b/cd']
>> Change that to [os.path.normpath(p)+'/' for p in paths] and you've got
> yourself a winner.
>Or possibly [os.path.normpath(p)+os.path.sep for p in paths]?
regards
 Steve
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