save project

snake.py

@@ -20,13 +20,15 @@ while True:
             # 接收到退出事件后退出程序
             exit()
     x  += 30
+    position.append((x,y))
+    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
     screen.blit(right, position[-1])
     # 将贪吃蛇的身体画上去
-    for i in range(len, (position)-1):
-    screen.blit(body, position[i])
+    for i in range(len(position)-1):
+        screen.blit(body, position[i])
     
     # 将果实画上去
     screen.blit(food, (360, 300))