save project

snake.py

@@ -64,7 +64,7 @@ while True:
 
     if x<0 or x>630 or y<0 or y>450:
         exit()     
-    for i,j in pos[:-1]:
+    for i,j in position[:-1]:
         if x==i and y==j:
             exit()
     # 将背景图画上去