save project

snake.py

@@ -51,8 +51,9 @@ while True:
         y -= 30
     else:
         y += 30
+    
+    
     position.append((x, y))
-    position.pop(0)
     # 将背景图画上去
     screen.blit(background, (0, 0))
     if x==apple_x and y==apple_y:
@@ -60,6 +61,8 @@ while True:
         num2=random.randint(0,15)
         apple_x=num1*30
         apple_y=num2*30
+    else:
+        position.pop(0)
     # 将贪吃蛇的头画上去
     screen.blit(snake_head, position[-1])
     # 将贪吃蛇的身体画上去