A /set/ object is New in version 2.4. maybe Sets.set in python2.3 == set nearly. Uwe Fechner wrote: > Hello, > > I was trying to install ipython on windows xp, but I get the following error message > during the post install script: > > validkey =set(['cancel', 'backspace', 'tab', 'clear', > NameError: name 'set' is not defined > >