6 черепаха подсчет повторяющихся точек

from turtle import *


def count_coords(st, f):
    global dots, answ
    for x in range(int(st[0]), int(f[0]) + 1, k):
        for y in range(int(st[1]), int(f[1]) + 1, k):
            if (x, y) in dots:
                answ += 1
            else:
                dots.add((x, y))


screensize(1000, 1000)
tracer(0)
k = 35
#shearfactor(0.5)
dots = set([])
answ = 0
for i in range(4):
    for i in range(4):
        s = (xcor(), ycor())
        forward(k * 6)
        f = (xcor(), ycor())
        count_coords(s, f)
        right(90)
    s = (xcor(), ycor())
    forward(k * 10)
    f = (xcor(), ycor())
    count_coords(s, f)
    right(90)
    s = (xcor(), ycor())
    forward(k * 3)
    f = (xcor(), ycor())
    count_coords(s, f)

up()

for x in range(-100, 100):
    for y in range(-100, 100):
        goto(x * k, y * k)
        dot(4, 'blue')
print(answ)
done()