绘制正方形

import turtle
turtle.setup(800, 800, 200, 200)
turtle.pencolor("black")
turtle.pensize(5)
turtle.penup()
turtle.fd(-150)
turtle.pendown()
turtle.fd(100)
turtle.left(90)
turtle.fd(100)
turtle.left(90)
turtle.fd(100)
turtle.left(90)
turtle.fd(100)
turtle.done()