exercise_21.py

# draw pentagon by turtle graphics.
import turtle
turtle.speed(1)
turtle.getscreen()
turtle.shape("turtle")
turtle.forward(100)
turtle.left(72)
turtle.forward(100)
turtle.lt(72)
turtle.forward(100)
turtle.lt(72)
turtle.forward(100)
turtle.lt(72)
turtle.forward(100)
turtle.mainloop()