turtle_race.py

from turtle import Turtle,Screen
import random
screen = Screen() 
screen.setup(width=600,height=600)
screen.title('Turtle Race')
turtles = []
speed = 10
y = -100
in_screen = True

#make turtles by appending an instance of a turtle to turtles list in an iteration 
#all properties of that instance are declared inside the loop
def make_turtle():
    global y
    for i in range(0,5):
        t = Turtle()
        t.penup()
        t.shape("turtle")
        t.color("light green")
        random_number1 = random.randint(-300,300)
        random_number2 = random.randint(-300,300)
        t.goto(-280, y)
        y+=50
        turtles.append(t)
#move the turtle forward by a random number
def move_turtles():
    for turtle in turtles: 
        random_number1 = random.randint(0,50)
        turtle.forward(random_number1)

make_turtle()   
while in_screen==True:     
    move_turtles()
    #iterate through turtles list and check if any has gone beyond the screen
    #if so the race ends
    for turtle in turtles:
        xposition = turtle.xcor()
        if xposition >=270:
            in_screen = False
            

screen.exitonclick()