Much simpler structure for VPython-wx

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Steve Spicklemire figured out a much simpler scheme for VPython-wx which
eliminates the strange "double import" structure I had created, in which
you import visual, and visual imports you.

Instead, he uses the "atexit" module to define a function to be called at
the end of a Python program. That end-of-program function enters and
endless while loop containing rate(30), which keeps the graphics window
alive for zoom and spin. There is no double import.

Many thanks, Steve!

Bruce Sherwood

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<div dir=3D"ltr">Steve Spicklemire figured out a much simpler scheme for VP=
ython-wx which eliminates the strange &quot;double import&quot; structure I=
 had created, in which you import visual, and visual imports you.<div><br>
</div><div style>Instead, he uses the &quot;atexit&quot; module to define a=
 function to be called at the end of a Python program. That end-of-program =
function enters and endless while loop containing rate(30), which keeps the=
 graphics window alive for zoom and spin. There is no double import.</div>
<div style><br></div><div style>Many thanks, Steve!</div><div style><br></d=
iv><div style>Bruce Sherwood</div></div>

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