Just a quick bug report. I'm sure this must not be new. When the IDLE tool tips for built-in functions appear, they "steal" the focus from text entry area. You're dead in the water until you mouse-click on the text area. Reproducible. Just type 'range(' and see what happens. OSX 10.2.3, Python 2.3a1, Tibook. Jim Harrison Univ. of Pittsburgh