save project

snake.py

@@ -39,12 +39,17 @@ while True:
                 snake_head=down
     if setheading=='right':
         x+=30
-    if setheading=='left':
+    elif setheading=='left':
         x-=30
-    if setheading=='up':
+    elif setheading=='up':
         y-=30
-    if setheading=='down':
+    else:
         y+=30
+    position.apple((x,y))
+    position.pop(0)
+    screen.blit(snake_head,position[-1])
+    screen.blit(background,(0,0))
+    screen.blit(apple,(420,150))
     #x+=30
     # 将背景图画上去
     screen.blit(background, (0, 0))