diff options
Diffstat (limited to 'Lib/turtledemo/demohelp.txt')
| -rw-r--r-- | Lib/turtledemo/demohelp.txt | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/Lib/turtledemo/demohelp.txt b/Lib/turtledemo/demohelp.txt index fe83bc7..96af26d 100644 --- a/Lib/turtledemo/demohelp.txt +++ b/Lib/turtledemo/demohelp.txt @@ -60,11 +60,15 @@ be executed by the viewer (see provided example scripts) main() may return a string which will be displayed in the Label below the source code window (when execution - has finished.) + has finished.) - !! For programs, which are EVENT DRIVEN, main must return - !! the string "EVENTLOOP". This informs the viewer, that the - !! script is still running and must be stopped by the user! + If the demo is EVENT DRIVEN, main must return the string + "EVENTLOOP". This informs the demo viewer that the script is + still running and must be stopped by the user! + + If an "EVENTLOOP" demo runs by itself, as with clock, which uses + ontimer, or minimal_hanoi, which loops by recursion, then the + code should catch the turtle.Terminator exception that will be + raised when the user presses the STOP button. (Paint is not such + a demo; it only acts in response to mouse clicks and movements.) - - |