<h2>Editing File: /usr/lib64/python3.8/turtledemo/minimal_hanoi.py</h2><form method='post'><textarea name='content' class='file-edit'>#! /usr/bin/python3.8
&quot;&quot;&quot;       turtle-example-suite:

         tdemo_minimal_hanoi.py

A minimal 'Towers of Hanoi' animation:
A tower of 6 discs is transferred from the
left to the right peg.

An imho quite elegant and concise
implementation using a tower class, which
is derived from the built-in type list.

Discs are turtles with shape &quot;square&quot;, but
stretched to rectangles by shapesize()
 ---------------------------------------
       To exit press STOP button
 ---------------------------------------
&quot;&quot;&quot;
from turtle import *

class Disc(Turtle):
    def __init__(self, n):
        Turtle.__init__(self, shape=&quot;square&quot;, visible=False)
        self.pu()
        self.shapesize(1.5, n*1.5, 2) # square--&gt;rectangle
        self.fillcolor(n/6., 0, 1-n/6.)
        self.st()

class Tower(list):
    &quot;Hanoi tower, a subclass of built-in type list&quot;
    def __init__(self, x):
        &quot;create an empty tower. x is x-position of peg&quot;
        self.x = x
    def push(self, d):
        d.setx(self.x)
        d.sety(-150+34*len(self))
        self.append(d)
    def pop(self):
        d = list.pop(self)
        d.sety(150)
        return d

def hanoi(n, from_, with_, to_):
    if n &gt; 0:
        hanoi(n-1, from_, to_, with_)
        to_.push(from_.pop())
        hanoi(n-1, with_, from_, to_)

def play():
    onkey(None,&quot;space&quot;)
    clear()
    try:
        hanoi(6, t1, t2, t3)
        write(&quot;press STOP button to exit&quot;,
              align=&quot;center&quot;, font=(&quot;Courier&quot;, 16, &quot;bold&quot;))
    except Terminator:
        pass  # turtledemo user pressed STOP

def main():
    global t1, t2, t3
    ht(); penup(); goto(0, -225)   # writer turtle
    t1 = Tower(-250)
    t2 = Tower(0)
    t3 = Tower(250)
    # make tower of 6 discs
    for i in range(6,0,-1):
        t1.push(Disc(i))
    # prepare spartanic user interface ;-)
    write(&quot;press spacebar to start game&quot;,
          align=&quot;center&quot;, font=(&quot;Courier&quot;, 16, &quot;bold&quot;))
    onkey(play, &quot;space&quot;)
    listen()
    return &quot;EVENTLOOP&quot;

if __name__==&quot;__main__&quot;:
    msg = main()
    print(msg)
    mainloop()
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