Message 76562 - Python tracker
Start IDLE, and hit Ctrl-N twice to create two windows named "Untitled": This displays the message """ warning: callback failed in WindowList <class 'TypeError'> : unorderable types: ListedToplevel() < ListedToplevel() """ And the "Windows" menu does not contain the windows list. This is specific to python 3: Windows objects cannot be ordered any more. Patch is attached.