save project

snake.py

@@ -58,9 +58,9 @@ while True:
         apple_x = c*30-30
         apple_y = d*30-30
     else:
-
+        position.pop(0)
     position.append((x, y))
-    position.pop(0)
+    
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去