利用random标准库，完成人机石头剪刀布的游戏，三局两胜

在Python中，你可以利用`random`库来模拟随机选择石头、剪刀或布的手势。这里是一个简单的例子，展示如何编写一个三局两胜的人机石头剪刀布游戏：

import random

# 定义游戏选项
options = ['rock', 'paper', 'scissors']

def game_round(player_choice):
    computer_choice = random.choice(options)
    print(f"Player chose: {player_choice}")
    print(f"Computer chose: {computer_choice}")

    if player_choice == computer_choice:
        result = "It's a tie!"
    elif (player_choice == 'rock' and computer_choice == 'scissors') or \
         (player_choice == 'paper' and computer_choice == 'rock') or \
         (player_choice == 'scissors' and computer_choice == 'paper'):
        result = "You win!"
    else:
        result = "Computer wins!"

    return result

def play_game():
    for round_num in range(1, 4):
        print(f"Round {round_num}:")
        player_input = input("Enter your choice (rock/paper/scissors): ")
        while player_input not in options:
            print("Invalid choice! Please try again.")
            player_input = input()

        outcome = game_round(player_input)
        print(outcome)

        if round_num == 2:
            # 如果已经打完两局，判断胜负
            if outcome == "You win!" * 2:
                print("Congratulations! You've won the game!")
                break
            elif outcome == "Computer wins!" * 2:
                print("Sorry, you lost. Better luck next time!")
                break
            else:
                print("Let's continue to the final round!")

play_game()

在这个程序中，玩家输入他们的选择，电脑随机选择，然后根据规则判断胜负。如果到了第二局结束，会直接宣布结果。