import pygame, sys
from pygame.locals import *

pygame.init()

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

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

mySurface2 = pygame.Surface((100,50))
mySurface2.fill( (255,0,0) )

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

    displaysurface.blit(mySurface, (50,50))
    displaysurface.blit(mySurface2, (50,150))

    pygame.display.update()