用python绘制一个简单的蟒蛇

import turtle
turtle.setup(700, 400 , 300 , 200)
turtle.penup()
turtle.fd(-250)
turtle.pendown()
turtle.pensize(30)
turtle.pencolor("yellow")
turtle.seth(-40)
for i in range(4):
    turtle.circle(40 ,80)
    turtle.circle(-40 ,80)
turtle.circle(40 , 80/2)
turtle.fd(40)
turtle.circle(16 ,180)
turtle.fd(40 * 2/3)