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

Wed Dec 31 03:57:45 CET 2008

 Phillip> 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'.
 Phillip> ...because that's the correct answer.
I don't understand. If you search for os.path.commonprefix at
codesearch.google.com you'll find uses like this:
 if os.path.commonprefix([basedir, somepath]) != basedir:
 ...
which leads me to believe that other people using the current function in
the real world would be confused by your interpretation.
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