import pygame
import sys
import random

pygame.init()
screen = pygame.display.set_mode((1920, 1080))

pos = [960, 540]

while True :
    events = pygame.event.get()
    for event in events :
        if event.type == pygame.QUIT :
            pygame.quit()
            sys.exit()
        if event.type == pygame.KEYDOWN :
            if event.key == pygame.K_RIGHT :
                surface = pygame.Surface((1000, 1000))
                surface.fill((random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))
                pos[0] += 20
            if event.key == pygame.K_LEFT :
                surface = pygame.Surface((1000, 1000))
                surface.fill((random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))
                pos[0] -= 20
            if event.key == pygame.K_UP :
                surface = pygame.Surface((1000, 1000))
                surface.fill((random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))
                pos[1] -= 20
            if event.key == pygame.K_DOWN :
                surface = pygame.Surface((1000, 1000))
                surface.fill((random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))
                pos[1] += 20
            screen.blit(surface, pos)
            pygame.display.update()