NEVER use "sleep" in a GUI event loop, or you will block your gui from functioning the way you expect. Tk has a non-blocking sleep :
#instead of
sleep(10);
#use
$mw->after(10);
and your code example will run.
In GUI programing always think in terms of the "event loop". The event loop dosn't start to run until you get to the MainLoop line. But if you sleep(10), it takes 10 seconds to start.
I'm not really a human, but I play one on earth.
flash japh
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