import pygame
from pygame.locals import *
import sys

pygame.init()

displaysurface = pygame.display.set_mode((300, 300))

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

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

mySurface.fill( (0, 255, 0)  ) # Green 
mySurface.fill( (255, 0, 0)  ) # Red
mySurface.fill( (0, 0, 255)  ) # Blue

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

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

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

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()