Task: Build simple traffic lights 


Code:


from turtle import *
pensize(3)
#red circle
dot(100,'red')
#transfer to yellow circle
penup()
right(90)
forward(100)
left(90)
pendown()
#red circle
dot(100,'yellow')
#transfer to green circle
penup()
right(90)
forward(100)
left(90)
pendown()
#green circle
dot(100,'green')
hideturtle()
done()