import pygame
import random
import sys
 
FPS = 60
W = 500
H = 500 
WHITE = (255, 255, 255)
BLUE = (0, 70, 225)

 
sc = pygame.display.set_mode((W, H))
clock = pygame.time.Clock()
sc.fill(WHITE)

x = 10
y = 10
surf = pygame.Surface((10, 10))
surf.fill((255, 0, 0)) 
sc.fill((200, 255, 200))
direction = 0

while 1:
    for i in pygame.event.get():
        if i.type == pygame.QUIT:
            sys.exit()
        elif i.type == pygame.KEYDOWN:
            if i.key == pygame.K_RIGHT:
                direction = 0
            elif i.key == pygame.K_LEFT:
                direction = 1
            elif i.key == pygame.K_DOWN:
                direction = 2
            elif i.key == pygame.K_UP:
                direction = 3
    if direction == 0: x = x + 10
    if direction == 1: x = x - 10
    if direction == 2: y = y + 10
    if direction == 3: y = y - 10
    if (x < 10):    
     x = 400
     y = random.randint(10,400)
    if (x > 400): 
     x = 10
     y = random.randint(10,400)
    if (y < 10): 
     y = 400
     x = random.randint(10,400)
    if (y > 400): 
     y = 10
     x = random.randint(10,400)
    
    
    rect = pygame.Rect((x, y, 0, 0))
    sc.blit(surf, rect)

    pygame.display.update()
    clock.tick(FPS)