Due quadrati concentrici

import math
import turtle
WIDTH = 500
HEIGHT = 500
r2 = math.sqrt(2)/2
DIM1 = 0.8*HEIGHT
DIM2 = r2*DIM1
PASSI = [DIM1,DIM1,DIM1,DIM1/2, DIM2,DIM2,DIM2,DIM2, DIM1/2]
ANGOLI = [ 90, 90, 90, 45, 90, 90, 90, 45, 90]
turtle.setup(WIDTH, HEIGHT)
turtle.title("Un solo tratto")
turtle.shape('turtle')
turtle.pencolor('red')
turtle.bgcolor('pink')
turtle.pensize(4)
turtle.penup()
turtle.setposition(-DIM1/2, -DIM1/2)
turtle.pendown()
for passo, angolo in zip(PASSI, ANGOLI):
turtle.forward(passo)
turtle.left(angolo)
Con la stessa tecnica ma con 4 quadrati concentrici

...
DIM1 = 0.8*HEIGHT
DIM2 = r2*DIM1
DIM3 = r2*DIM2
DIM4 = r2*DIM3
PASSI = [DIM1,DIM1,DIM1,DIM1/2, DIM2,DIM2,DIM2,DIM2/2, DIM3,DIM3,DIM3,DIM3/2, DIM4,DIM4,DIM4,DIM4, DIM3/2,DIM2/2,DIM1/2]
ANGOLI = [ 90, 90, 90, 45, 90, 90, 90, 45, 90, 90, 90, 45, 90, 90, 90, 45, 45, 45, 90]
...