Код:

from turtle import *
speed(0)
penup()
left(90)
for x in range(-400, 500, 100):
    if x % 200 == 0:
        setposition(x, -200)
    else:
        setposition(x, -150)
    for size in range(140, 10, -30):
        dot(size)
        forward(size + 10)