import pygame
import sys
from pygame.locals import *

pygame.init()

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

mySurface1 = pygame.Surface((50, 50))
mySurface1.fill((0, 255, 0))

mySurface2 = pygame.Surface((100, 100))
mySurface2.fill((255, 0, 0))

mySurface3 = pygame.Surface((50, 150))
mySurface3.fill((0, 0, 255))

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    displaysurface.blit(mySurface1, (150, 150))
    displaysurface.blit(mySurface2, (400, 50))
    displaysurface.blit(mySurface3, (500, 400))

    pygame.display.update()