save project

snake.py

@@ -56,7 +56,8 @@ while True:
         y += 30
     position.append((x, y))
     #不能出框
-    if y>630 or y<0 or x>450 or x<0
+    if y>630 or y<0 or x>450 or x<0:
+        position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     # 将贪吃蛇的头画上去
@@ -64,7 +65,6 @@ while True:
     # 将贪吃蛇的身体画上去
     for i in range(len(position)-1):
         screen.blit(body, position[i])
-
     if x==food_x and y==food_y:
         gj1=random.randint(1,22)
         gj2=random.randint(1,16)