pygame #2

import pygame, sys

max_tps = 100.0

pygame.init()

screen = pygame.display.set_mode((720,576))
box = pygame.Rect(10,10,50,50)
clock = pygame.time.Clock()
delta = 0.0

while True:
  for event in pygame.event.get():
    if event.type == pygame.KEYDOWN and event.key == pygame.K_ESCAPE:
      sys.exit(0)

  delta += clock.tick()/1000.0
  while delta > 1/max_tps:
    delta -= 1/max_tps #delta = delta - 1/max_tps

  keys = pygame.key.get_pressed()
  if keys[pygame.K_UP]: #w
    box.y -= 1
  if keys[pygame.K_DOWN]:
    box.y += 1
  if keys[pygame.K_LEFT]:
    box.x -= 1
  if keys[pygame.K_RIGHT]:
      box.x += 1

  screen.fill((0,0,0))
  pygame.draw.rect(screen, (211, 149, 247), box)
  pygame.display.flip()