save project

snake.py

@@ -27,13 +27,12 @@ while True:
         if event.type==locals.KEYDOWN:
             if  event.key==locals.K_RIGHT and setheading!=right:
                 setheading='right'
-                snakehead=right
-        x=x+30        
+                snakehead=right        
 
             if  event.key==locals.K_LEFT and setheading!=left:
                 setheding='left'
                 snakehead=left
-        x=x-30
+        
             if  event.key==locals.K_DOWN and setheading!=down:
                 setheading='down'
                 snakehead=down
@@ -42,7 +41,15 @@ while True:
                 setheading='up' 
                 snakehead=up
                 
-    
+    if setheading=='right':
+        x=x+30
+    elif setheading=='left':
+        x=x-30
+    elif    setheading=='down':
+        y=y+30
+    else:
+        y=y-30
+
     position.append((x,y))
     position.pop(0)
     # 将背景图画上去