import pygame
from pygame import locals
pygame.init()#初始化
background=pygame.image.load("bg.png")
right=pygame.image.load("right.png")
body=pygame.image.load("body.png")
food=pygame.image.load("apple.png")
screen=pygame.display.set_mode((660,480))
x,y=240,120
position=[(180,90),(180,120),(210,120),(x,y)]
FP=pygame.time.Clock()
while True:
    for event in pygame.event.get():
        if event.type==locals.QUIT:
            exit()
    x=x+30
    position.append((x,y))
    position.pop(0)
    screen.blit(background,(0,0))
    screen.blit(right,position[-1])
    for i in range(len(position)-1):
        screen.blit(body,position[i])
    screen.blit(food,(360,300))
    #screen.blit(body,(210,120))
    #screen.blit(body,(180,120))
    #screen.blit(body,(180,90))
    pygame.display.update()
    FP.tick(1)