Issue #21823: Catch turtle.Terminator exceptions in turtledemo.
Add note to demohelp.txt about doing so.
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@ -11,6 +11,7 @@ and time
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------------------------------------
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"""
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from turtle import *
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from turtle import Terminator # not in __all__
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from datetime import datetime
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mode("logo")
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@ -102,22 +103,25 @@ def tick():
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sekunde = t.second + t.microsecond*0.000001
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minute = t.minute + sekunde/60.0
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stunde = t.hour + minute/60.0
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tracer(False)
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writer.clear()
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writer.home()
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writer.forward(65)
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writer.write(wochentag(t),
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align="center", font=("Courier", 14, "bold"))
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writer.back(150)
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writer.write(datum(t),
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align="center", font=("Courier", 14, "bold"))
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writer.forward(85)
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tracer(True)
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second_hand.setheading(6*sekunde)
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minute_hand.setheading(6*minute)
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hour_hand.setheading(30*stunde)
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tracer(True)
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ontimer(tick, 100)
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try:
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tracer(False) # Terminator can occur here
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writer.clear()
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writer.home()
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writer.forward(65)
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writer.write(wochentag(t),
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align="center", font=("Courier", 14, "bold"))
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writer.back(150)
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writer.write(datum(t),
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align="center", font=("Courier", 14, "bold"))
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writer.forward(85)
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tracer(True)
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second_hand.setheading(6*sekunde) # or here
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minute_hand.setheading(6*minute)
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hour_hand.setheading(30*stunde)
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tracer(True)
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ontimer(tick, 100)
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except Terminator:
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pass # turtledemo user pressed STOP
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def main():
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tracer(False)
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@ -60,11 +60,15 @@
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be executed by the viewer (see provided example scripts)
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main() may return a string which will be displayed
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in the Label below the source code window (when execution
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has finished.)
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has finished.)
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!! For programs, which are EVENT DRIVEN, main must return
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!! the string "EVENTLOOP". This informs the viewer, that the
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!! script is still running and must be stopped by the user!
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If the demo is EVENT DRIVEN, main must return the string
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"EVENTLOOP". This informs the demo viewer that the script is
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still running and must be stopped by the user!
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If an "EVENTLOOP" demo runs by itself, as with clock, which uses
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ontimer, or minimal_hanoi, which loops by recursion, then the
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code should catch the turtle.Terminator exception that will be
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raised when the user presses the STOP button. (Paint is not such
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a demo; it only acts in response to mouse clicks and movements.)
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@ -18,6 +18,7 @@ stretched to rectangles by shapesize()
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---------------------------------------
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"""
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from turtle import *
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from turtle import Terminator # not in __all__
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class Disc(Turtle):
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def __init__(self, n):
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@ -50,9 +51,12 @@ def hanoi(n, from_, with_, to_):
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def play():
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onkey(None,"space")
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clear()
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hanoi(6, t1, t2, t3)
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write("press STOP button to exit",
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align="center", font=("Courier", 16, "bold"))
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try:
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hanoi(6, t1, t2, t3)
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write("press STOP button to exit",
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align="center", font=("Courier", 16, "bold"))
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except Terminator:
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pass # turtledemo user pressed STOP
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def main():
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global t1, t2, t3
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