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b992a0e102
requires them. Disable executable bits and shebang lines in test and benchmark files in order to prevent using a random system python, and in source files of modules which don't provide command line interface. Fixed shebang line to use python3 executable in the unittestgui script.
76 lines
1.9 KiB
Python
Executable file
76 lines
1.9 KiB
Python
Executable file
#!/usr/bin/env python3
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""" 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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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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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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