At 09:30 PM 12/30/2008 -0500, rdmur...@bitdance.com wrote:
On Tue, 30 Dec 2008 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.

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