save project

snake.py

@@ -53,9 +53,10 @@ while True:
         x+=30
     snake.append((x,y))
     if x==apple_x*30 and y==apple_y*30:
-        apple_x=random.randint(0,22)    
-        apple_y=random.randint(0,16) 
-    snake.pop(0)
+        apple_x=random.randint(0,21)    
+        apple_y=random.randint(0,15)
+    else:
+        snake.pop(0)
     # 将贪吃蛇的身体画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去