python画图蝌蚪

import turtle

turtle.bgcolor('yellow')
turtle.pensize(2)
turtle.penup()
turtle.bk(250)
 
for _ in range(5):
    turtle.penup()
    turtle.setheading(90)
    turtle.sety(-200)
    turtle.setx(turtle.xcor() + 100)
    turtle.pendown()
    turtle.circle(630,10)
    turtle.circle(-630,10)
    turtle.dot(40)

turtle.done()