剪刀石头布游戏-代码没有给我任何输出

import random

def get_user_choice():
    while True:
        user_choice = input("请输入你的选择（剪刀、石头、布）：").strip().lower()
        if user_choice in ['剪刀', '石头', '布']:
            return user_choice
        else:
            print("无效输入，请重新输入。")

def get_computer_choice():
    choices = ['剪刀', '石头', '布']
    return random.choice(choices)

def determine_winner(user_choice, computer_choice):
    if user_choice == computer_choice:
        return "平局"
    elif (user_choice == '剪刀' and computer_choice == '布') or \
         (user_choice == '石头' and computer_choice == '剪刀') or \
         (user_choice == '布' and computer_choice == '石头'):
        return "你赢了！"
    else:
        return "电脑赢了！"

def main():
    user_choice = get_user_choice()
    computer_choice = get_computer_choice()
    print(f"你的选择是：{user_choice}")
    print(f"电脑的选择是：{computer_choice}")
    result = determine_winner(user_choice, computer_choice)
    print(result)

if __name__ == "__main__":
    main()