我无法为更高的游戏保存我的高分

Question

import random
import pickle

leaderboard = []

replay = True

scorefile = open("highscores", "rb")


leaderboard = pickle.load(scorefile)
    
scorefile.close()



while replay:
    number_to_guess = random.randint(1,100)

    player_name = input("Please enter your name: ")
    
    score = 0
    game_over = False
    
    
    while not game_over:
        guess = int(input("Please enter a number between 1 and 100: "))

        if guess < number_to_guess:
            print("Your guess is too low.")
            score += 1

        elif guess > number_to_guess:
            print("Your guess is too high.")
            score += 1
        else:
            print("You are correct!")
            print("Your score was "+ str(score))
            game_over = True
            leaderboard.append([score, player_name])
            leaderboard.sort()

            print(leaderboard)



    again = input("Would you like to play again? (y/n) ")

    scorefile = open("highscores", "wb")

    if replay == "n":
        replay = False
        pickle.dump(leaderboard, scorefile)
        scorefile.close