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c8b45a385a
* gh-118673: Remove shebang and executable bits from stdlib modules. * Removed shebangs and exe bits on turtledemo scripts. The setting was inappropriate for '__main__' and inconsistent across the other modules. The scripts can still be executed directly by invoking with the desired interpreter.
79 lines
2.0 KiB
Python
79 lines
2.0 KiB
Python
""" turtle-example-suite:
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tdemo_minimal_hanoi.py
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A minimal 'Towers of Hanoi' animation:
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A tower of 6 discs is transferred from the
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left to the right peg.
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An imho quite elegant and concise
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implementation using a tower class, which
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is derived from the built-in type list.
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Discs are turtles with shape "square", but
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stretched to rectangles by shapesize()
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---------------------------------------
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To exit press STOP button
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---------------------------------------
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"""
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from turtle import *
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class Disc(Turtle):
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def __init__(self, n):
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Turtle.__init__(self, shape="square", visible=False)
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self.pu()
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self.shapesize(1.5, n*1.5, 2) # square-->rectangle
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self.fillcolor(n/6., 0, 1-n/6.)
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self.st()
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class Tower(list):
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"Hanoi tower, a subclass of built-in type list"
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def __init__(self, x):
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"create an empty tower. x is x-position of peg"
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self.x = x
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def push(self, d):
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d.setx(self.x)
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d.sety(-150+34*len(self))
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self.append(d)
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def pop(self):
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d = list.pop(self)
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d.sety(150)
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return d
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def hanoi(n, from_, with_, to_):
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if n > 0:
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hanoi(n-1, from_, to_, with_)
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to_.push(from_.pop())
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hanoi(n-1, with_, from_, to_)
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def play():
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onkey(None,"space")
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clear()
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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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ht(); penup(); goto(0, -225) # writer turtle
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t1 = Tower(-250)
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t2 = Tower(0)
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t3 = Tower(250)
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# make tower of 6 discs
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for i in range(6,0,-1):
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t1.push(Disc(i))
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# prepare spartanic user interface ;-)
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write("press spacebar to start game",
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align="center", font=("Courier", 16, "bold"))
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onkey(play, "space")
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listen()
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return "EVENTLOOP"
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if __name__=="__main__":
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msg = main()
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print(msg)
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mainloop()
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