text: import pygame
  pygame.init()
  x = 0
  y = 100
  surf = pygame.display.set_mode((400, 400), pygame.SRCALPHA)
  while True:
      surf.fill ((255,255,255))
      pygame.draw.circle (surf, (0,0,200), (x,y), 20)
      x = x + 1
      pygame.display.update()
  