save project

snake.py

@@ -50,13 +50,17 @@ while True:
         x -= 30
     elif setheading == "up":
         y -= 30
-    else:
+    position.clear((x,y))
         y += 30
     position.append((x, y))
-    position.pop(0)
+
     if x==apple_x and y==apple_y:
+        num1=random.randint(1,22)
+        num2=random.randint(1,16)
         apple_x=random.randint(0,660)
         apple_y=random.randint(0,480)
+    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