save project

snake.py

@@ -29,14 +29,27 @@ while True:
         if event.type ==locals.KEYDOWN:
             if event.key==locals.K_LEFT and setheading != 'right':
                 setheading='left'
+                snake_head=left
+
             if event.key==locals.K_DOWN and setheading != 'UP':
                 setheading='down'
+                snake_head=down
+
             if event.key==locals.K_UP and setheading != 'down':
                 setheading='up'
+                snake_head=up
+
             if event.key==locals.K_RIGHT and setheading != 'left':
                 setheading='right'
-    
-    x+=30
+                snake_head=right
+    if setheading=='right':
+        x+=30
+    elif setheading=='left':
+        x-=30
+    elif setheading=='up':
+        y-=30
+    else:
+        y+=30
     poat.append((x,y))
     poat.pop(0)
     # 将背景图画上去