Python snake po lekcji 21_02

import pygame, time, random

pygame.init()

black = (0,0,0)
white = (255, 255, 255)
green = (0, 255, 0)
blue = (0, 0, 255)

dis_width = 600
dis_height = 400

dis = pygame.display.set_mode((dis_width, dis_height))

game_over = False

x1 = 300
y1 = 300

x1_change = 0
y1_change = 0

while not game_over:
  for event in pygame.event.get():
    if event.type==pygame.QUIT:
      game_over = True
    if event.type == pygame.KEYDOWN:
      if event.key == pygame.K_LEFT:
        x1_change = -10
        y1_change = 0
      elif event.key == pygame.K_RIGHT:
        x1_change = 10
        y1_change = 0
      elif event.key == pygame.K_UP:
        x1_change = 0
        y1_change = -10
      elif event.key == pygame.K_DOWN:
        x1_change = 10
        y1_change = 0

  pygame.draw.rect(dis, white, [100, 100, 10, 10])
  pygame.display.update()

pygame.quit()
quit()