In response to suggestions, the instructions for installing VIDLE have
been improved. See http://vpython.org/vidle.
If you have used VPython for many years, you may remember that it used
to be that you could make a change in your file while looking at the
graphics window for the previous run, then re-run your new file and the
old graphics window would immediately disappear and the new one appear.
A few years ago changes were made to the standard IDLE that broke this
convenient behavior, so that a re-run gave you TWO graphics windows.
VIDLE restores the original useful behavior. VIDLE also restores
important missing menu items on the Mac.
Bruce Sherwood
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