[Tutor] Closing GUI program

[Jim Morcombe]

I have copied the following program.  When I run it, (By pressing F5 from IDLE), it displays the "Hello world" message.

When I close the window, the "Hello world" message disappears, but it seems that the program is still running, because when I close the shell, i get the message "The program is still running.  Do you want to kill it?"

How do I get the program to terminate when the window is closed?

Jim
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