The Tortoise and the Hare Simulation with Python Code

Everyone knows this historical story!!! The tortoise and the Hare had a race. Sheer determination and dedication made the hare win the race. We, in this post, are going to create that story. No exactly ;). It is just a simulation of the famous race but it doesn’t end with tortoise’s win. While inching towards the winning line, both the contestants face various hurdle and distractions which are used to define their journey.

First let’s understand the presumptions about speed accelerators and decelerators for these two.

The hare may

  • Hop at full speed
  • Hop at a slow speed
  • Slip a bit from bumps on the way
  • Slip to a great extent due to hillocks
  • Sleep to rest

The tortoise never sleeps on the way. He may

  • Plod at full speed
  • Slip
  • Plod at slow speed

With these premises about our contenders, class race is created with two methods to represent their movement- moveRabbit and  moveTortoise. The above mentioned motion specifiers are used as conditions to define the distance covered (forward or backward) by each of them. The movement of each contender is selected on the basis of a random number generated between 1 and 10. This generated number is checked against certain values and a value is returned.

The tortoise and the Hare- Race Path

The interface is created with the GraphWin object from graphics.py.  gif images of rabbit and tortoise are used to display their motion. For this Image method from graphics.py is used. It accepts first argument as a point and second argument as the name of the image file (.gif) to be displayed.

The Y coordinates of the tortoise and the hare are not changed. With every call to the methods of race class (moveRabbit and  moveTortoise ) the X coordinates of the contestants are updated and moved to the new position. undraw() method is used to clear a contestant at its last position before moving.

Simulation starts when a viewer clicks in the window. Simulation ends when either of the participants crosses the finish line (depicted by word Winner). The winner is declared and its prize (carrot or bag of insects) is displayed.

Program Code

import random
import time
from graphics import *

class race:
    def __init__(self,turtle,rabbit):
        self.turtle=turtle
        self.rabbit=rabbit
        
    def  moveTurtle(self):
        r=random.randrange(9)+1
        turtleMoves=[3,6]
        if (r>=1 and r<=5):
            self.turtle=turtleMoves[0]
        elif (r==6 or r==7):
            self.turtle=-turtleMoves[1]
        else:
            self.turtle=1
        return self.turtle          
                        
    def  moveRabbit(self):
        r=random.randrange(9)+1
        rabbitMoves=[9,12,2]
        if (r==3 or r==4):
            self.rabbit=rabbitMoves[0]
        elif (r==5):
            self.rabbit=-rabbitMoves[1]
        elif (r>=6 and r<=8):
            self.rabbit=rabbitMoves[2]
        elif (r>8):
             self.rabbit=-2
              
        return self.rabbit       

             

def main():
    timer=0
    markLn=0
    #create race path
    workArea = GraphWin('Simulation of Turtle and Rabbit Race', 800, 200) # give title and dimensions
    workArea.setBackground('white')
    stx=50
    sty=20
    p1=Image(Point(20,100),'start.gif')
    p1.draw(workArea)
    p1=Image(Point(750,100),'winner.gif')
    p1.draw(workArea)
    ln=Line(Point(stx,sty),Point(stx,sty+160))
    ln.draw(workArea)
    ln=Line(Point(700,sty),Point(700,sty+160))
    ln.draw(workArea)
        
    #set players at start line
    x1=30
    x2=30
    rPos=Point(x1,40)
    p1=Image(rPos,'rabbit.gif')
    p1.draw(workArea)
    tPos=Point(x2,140)
    p2=Image(tPos,'tortoise.gif')
    p2.draw(workArea)
    #Ask viewer to start race by clicking
    strt=Text(Point(workArea.width/2,workArea.height/2),"Get Set Go!!! click to start race")
    strt.setSize(24)
    strt.setFace('times roman')
    strt.setTextColor('green')
    strt.draw(workArea)
    workArea.getMouse()
    strt.undraw()
    race1=race(1,1)
    while (x1<=720 and x2<=720):
        x1=x1+race1.moveRabbit()*5
        if x1<1:
            x1=30
        rPos=Point(x1,40)
        p1.undraw()
        p1=Image(rPos,'rabbit.gif')
        p1.draw(workArea)
        x2=x2+race1.moveTurtle()*5
        if x2<1:
            x2=30
        tPos=Point(x2,140)
        p2.undraw()
        p2=Image(tPos,'tortoise.gif')
        p2.draw(workArea)
        timer+=1
        time.sleep(1)

    if (x1>=x2):
        msg=Text(Point(workArea.width/2,workArea.height/2),"Wonderful! Rabbit gets a")
        winner='rabbit.gif'
        prize='carrot.gif'
    else:
        msg=Text(Point(workArea.width/2,workArea.height/2),"Wow!!! Turtle gets")
        winner='tortoise.gif'
        prize='sack.gif'
    #diaplay winner    
    p1.undraw()
    p2.undraw()
    msg.setSize(24)
    msg.setFace('times roman')
    msg.setTextColor('orange')
    msg.draw(workArea)
    p2=Image(Point(workArea.width/2-50,workArea.height/2-50),winner)
    p2.draw(workArea)
    p2=Image(Point(workArea.width/2+100,workArea.height/2+50),prize)
    p2.draw(workArea)

main()

    

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