import pygame
window = pygame.display.set_mode((400, 400))
pygame.display.set_caption('Hello, pygame!')
screen = pygame.Surface((400, 400))
class Sprite:
    def __init__(self,xpos,ypos,filename):
        self.x=xpos
        self.y=ypos
        self.bitmap=pygame.image.load(filename)
        self.bitmap.set_colorkey((0,0,0))
    def render(self):
        screen.blit(self.bitmap,(self.x,self.y))
hero = Sprite(0, 0, 'images/h.png')
zet = Sprite(0, 0, 'images/z.png')
done = True
while done:
    for e in pygame.event.get():
        if e.type == pygame.QUIT:
            done = False
    screen.fill((50,50,50))
    hero.render()
    zet.reder()
    window.blit(screen, (0,0))
    pygame.display.flip()
    pygame.time.delay(5)