save project

snake.py

@@ -58,7 +58,7 @@ while True:
        apple_x=apple_x*30
        apple_y=apple_y*30
     else:
-        position.pop(0)
+         position.pop(0)   
     screen.blit(background, (0, 0))
     screen.blit(snake_head, position[-1])
     # 将贪吃蛇的身体画上去