auto save

snake.py

 import pygame
-
+import sys
+import os
 # 初始化pygame，为使用pygame做准备
 pygame.init()
 
 # 创建一个窗口
 screen = pygame.display.set_mode((800,600))
+background = pygame.image.load(os.path.join(os.path,"://source//bg.png"))
+
+while True:
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            sys.exit()
+
+    screen.blit(background,(0,0))
+    pygame.display.update()
\ No newline at end of file