save project

snake.py

@@ -38,6 +38,14 @@ while True:
             if event.key==locals.K_DOWN and setheading != "up":
                 setheading='down'
                 snake_head=down
+    if setheading=="right":
+        x+=30
+    elif setheading=="left":
+        x-=30
+    elif setheading=="up":
+        y-=30
+    else:
+        y+=30
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去