The code:
import turtle
import random
window = turtle.Screen()
window.colormode(255)
window.bgcolor(0,0,100)
border = 150
class MyTurtle(turtle.Turtle):
def __init__(self):
turtle.Turtle.__init__(self, shape="blank")
def setup(self):
self.width(random.randint(1,3))
self.penup()
self.setx(random.randint(-border+20,border-20))
self.sety(random.randint(-border+20,border-20))
self.pendown()
self.speed(0)
self.pencolor(random.randint(0,255),random.randint(0,255),random.randint(0,255))
def move(self):
maxStepSize = 40
self.circle(random.randint(-maxStepSize,maxStepSize),random.randint(0,270))
if self.xcor() < -border:
self.penup()
self.setx(self.xcor() + maxStepSize)
self.pendown()
if self.xcor() > border:
self.penup()
self.setx(self.xcor() - maxStepSize)
self.pendown()
if self.ycor() > border:
self.penup()
self.sety(self.ycor() - maxStepSize)
self.pendown()
if self.ycor() < -border:
self.penup()
self.sety(self.ycor() + maxStepSize)
self.pendown()
turtles = ["t1","t2","t3","t4","t5","t6","t7","t8","t9","t10"]
for i in range(len(turtles)):
turtles[i] = MyTurtle()
turtles[i].setup()
for i in range(50):
for i in range(len(turtles)):
turtles[i].move()
turtle.done()
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