save project

snake.py

@@ -59,7 +59,7 @@ while True:
         num2 = random.randint(1,16)
         apple_x = 30*num1-30
         apple_y = 30*num2-30
-        
+    else:  
         position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
@@ -73,4 +73,4 @@ while True:
     screen.blit(food, (apple_x, apple_y))
     # 刷新画面
     pygame.display.update()
-    FPSCLOCK.tick(3)
\ No newline at end of file
+    FPSCLOCK.tick(6)
\ No newline at end of file