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The snake game

from random import randint
from ion import keydown,KEY_BACK,KEY_DOWN,KEY_UP,KEY_LEFT,KEY_RIGHT
from kandinsky import *
from time import sleep

xmax,ymax=22,32

def dessine(x,y,c):
  for i in range(10):
    for j in range(10):
      set_pixel(x*10+i,y*10+j,c)

def nouvbonbon(serpent,bonbons):
  while True:
    bonbon=(randint(0,xmax-1),randint(0,ymax-1))
    if bonbon not in serpent and bonbon not in bonbons:
      return bonbon

def jeu():
 serpent=[(0,0),(0,1),(0,2)]
 tete=(0,2)
 sens="D"
 bonbons=set()
 bonbons={nouvbonbon(serpent,bonbons)}

 for x,y in serpent[:-1]:
    dessine(y,x,color(0,255,0))
 dessine(tete[1],tete[0],color(0,0,255))
 for bonbon in bonbons:
   dessine(bonbon[1],bonbon[0],color(255,0,0))

 while True:
  if keydown(KEY_BACK):
    break
  if keydown(KEY_UP):
    sens="H"
  if keydown(KEY_RIGHT):
    sens="D"
  if keydown(KEY_DOWN):
    sens="B"
  if keydown(KEY_LEFT):
    sens="G"
  if sens=="H":
    tete=((tete[0]-1)%xmax,tete[1])
  if sens=="D":
    tete=(tete[0],(tete[1]+1)%ymax)
  if sens=="B":
    tete=((tete[0]+1)%xmax,tete[1])
  if sens=="G":
    tete=(tete[0],(tete[1]-1)%ymax)
  if tete in serpent:
    break
  serpent.append(tete)
  dessine(tete[1],tete[0],color(0,0,255))
  if tete in bonbons:
    bonbons.discard(tete)
    bonbons.add(nouvbonbon(serpent,bonbons))
    if not len(serpent)%10:
      bonbons.add(nouvbonbon(serpent,bonbons))
  else:
    dessine(serpent[-2][1],serpent[-2][0],color(0,255,0))
    dessine(serpent[0][1],serpent[0][0],color(255,255,255))
    del serpent[0]
  for bonbon in bonbons:
    dessine(bonbon[1],bonbon[0],color(255,0,0))
  dessine(serpent[-2][1],serpent[-2][0],color(0,255,0))
  sleep(0.3/len(serpent)**.5)

 draw_string("FIN du jeu",100,100,
  color(200,0,0),color(200,200,200))
 draw_string("Score=%d"%len(serpent),120,120,
  color(200,0,0),color(200,200,200))