import pygame
import pygame.locals
import sys

pygame.init()

displaysurface = pygame.display.set_mode((400,600))

mySurface1 =pygame.Surface((50,50))
mySurface2 = pygame.Surface((50, 100))

mySurface1.fill((0, 250, 0))
mySurface2.fill((0, 250, 0))

screen = pygame.display.set_mode((400,300))
background = pygame.Surface((400, 300))

surface = pygame.Surface((10, 10))
surface.fill((0,255,0))

pos = [175, 125]

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 :
                pos[0] +=20
    pygame.display.update()
        

    screen.blit(background, (0, 0))
    screen.blit(surface, pos)
    pygame.display.update()