import turtle
import time
light = turtle.Turtle()
light.hideturtle()
light.screen.delay(0)
light.color("red", "red")
light.begin_fill()
light.circle(100)
light.end_fill()
time.sleep(1)
light.color("green", "green")
light.begin_fill()
light.circle(100)
light.end_fill()
time.sleep(1)
light.color("yellow", "yellow")
light.begin_fill()
light.circle(100)
light.end_fill()
time.sleep(1)
