Turtle Race
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Get this sample program up and running. Execute the script several times and
observe the results. If things are working normally, the race results should
be different on each execution of the script.
<![CDATA[
#!/usr/bin/python
import turtle
import random
finish_line=turtle.Pen()
finish_line.pencolor("white")
finish_line.pensize=5
finish_line.penup()
finish_line.setpos(360,-80)
finish_line.pendown()
finish_line.setpos(360,30)
finish_line.ht()
s=turtle.Pen()
s.pencolor("yellow")
t=turtle.Pen()
t.pencolor("orange")
p=turtle.Pen()
p.pencolor("cyan")
t.screen.bgcolor("black")
herd = [s,t,p]
stp = [-40,-20,0]
ct = 0
max = -200
for e in herd:
e.pensize=2
e.speed(1)
e.shape("turtle")
e.penup()
e.setpos(-200,stp[ct])
e.seth(0)
e.pendown()
ct+=1
while max<360:
for e in herd:
e.fd(int(random.random()*5))
if e.xcor()>max:
max=e.xcor()
turtle.mainloop()
]]>
To generate random numbers two lines are required:
- import random
- e.fd(int(random.random()*5))
The random.random() command generates a random value
between zero and one. Encapsulating it in int()
turns it into an integer value, which is only interesting if the value is
first multiplied by an integer.
It should be understood that int(random.random()*5)
returns a value between zero and five. Change the five to alter the possible
range of integer values which are generated.
ASSIGNMENT:
Add two more turtles to the race and have the winning turtle spin in place
five times after it hits the finish line.
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