python
import pygame
pygame.init()
size = (700, 500)
screen = pygame.display.set_mode(size)
clock = pygame.time.Clock()
x = 350
y = 250
speed_x = 0
speed_y = 0
running = True
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_UP:
speed_y = -1
elif event.key == pygame.K_DOWN:
speed_y = 1
x += speed_x
y += speed_y
screen.fill((0,0,0))
pygame.draw.rect(screen, (255,0,0), (x,y,50,50))
pygame.display.flip()
clock.tick(60)
pygame.quit()
