auto save

snake.py

@@ -53,8 +53,10 @@ while True:
         x -= 30
     elif setheading == "up":
         y -= 30
-    else:
+    elif setheading == "down":
         y += 30
+    elif setheading == "A":
+        y = 0
     
     position.append((x, y))
     # 将背景图画上去