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from turtle import *
from random import random,randint,choice

def trait(x, y, a, d):
  penup()
  goto(x, y)
  pendown()
  setheading(a)
  forward(d)

def grille(nb):
  case = min(H,L) // nb
  H_m, L_m = -nb * case / 2, -nb * case /2
  for i in range(1,nb):
    trait(L_m, H_m + case * i, 0, nb * case)
    trait(L_m + case * i, H_m, 90, nb * case)
  return case, H_m, L_m

def cercle(x,y,r,c):
  penup()
  color(c)
  goto(x,y - r)
  setheading(0)
  pendown()
  circle(int(r))

def croix(x,y,r,c):
 for i in [-1,1]:
  penup()
  color(c)
  goto(x - r, y + i * r)
  pendown()
  goto(x + r, y - i * r)

def pion(x,y,r,t1,t2):
  if t1 != t2:
    if t1 == 1: cercle(x,y,r,"white")
    elif t1 == 2: croix(x,y,r,"white")
    if t2 == 1: cercle(x,y,r,"black")
    elif t2 == 2: croix(x,y,r,"black")

speed(0)
hideturtle()
L,H = 320, 222
taille = 3
jeu = [0 for _ in range(taille * taille)]
case, H_m, L_m = grille(taille)
r = case / 2.3

while True:
 for c in range(taille):
  for l in range(taille):
   x, y, n = case * (c - (taille - 1) / 2),  case * (l - (taille - 1) / 2), taille * c + l
   v = choice([0,1,2])
   pion(x,y,r,jeu[n],v)
   jeu[n] = v