Hi, On Fri, Jul 8, 2011 at 2:08 AM, Giampaolo RodolĂ <g.rodola at gmail.com> wrote: >>>> isparent('/a', '/a/b') > True >>>> ischild('/a/b', '/a') > True Do you mean: >>> '/a' == dirname('/a/b') True >>> dirname('/a/b') == '/a' True I do not think it's harder to write. -- Paul