import pygame
from pygame.locals import *
import sys
pygame.init()

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

mySurface1 = pygame.Surface((50,50))
mySurface2 = pygame.Surface((50,100))
mySurface3 = pygame.Surface((100,50))

mySurface1.fill( (0, 255, 0) )
mySurface2.fill( (255, 0, 0) )
mySurface3.fill( (0, 0, 255) )

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

    displaysurface.blit(mySurface1,(150,150))
    displaysurface.blit(mySurface2,(400,150))
    displaysurface.blit(mySurface3,(200,200))

    pygame.display.update()