save project

snake.py

@@ -54,10 +54,12 @@ while True:
         y += 30
     position.append((x, y))
     if a==x and b==y:
-        a=random.randint(0,660)
-        b=random.randint(0,480)
-    
-    position.pop(0)
+        a1=random.randint(1,22)
+        b1=random.randint(1,16)
+        a=a1*30-30
+        b=b1*30-30
+    else:
+        position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去