Python用for循环画9个同心圆的靶盘

#画9个同心圆的靶盘
import turtle
r=10
for i in range(10):
    turtle.circle(i*r)
    turtle.seth(-90)
    turtle.penup()
    turtle.fd(r)
    turtle.seth(0)
    turtle.pendown()
turtle.done()