羽毛球比赛

import random
import os


# 介绍比赛以及程序
def print_introduce():
    print("This is a badminton game simulation program")
    print("The program requires two players' ability values (expressed in decimals from 0 to 1)")
    print("The last two student number: 49")
    '''
    羽毛球比赛规则
    1. 21分制，3局2胜为佳
    2. 每球得分制
    3. 每回合中，取胜的一方加1分
    4. 当双方均为20分时，领先对方2分的一方赢得该局比赛
    5. 当双方均为29分时，先取得30分的一方赢得该局比赛
    6. 一局比赛的获胜方在下一局率先发球
    '''


# 获得输入
def get_inputs():
    a = eval(input("Please enter the ability value of player A: "))
    b = eval(input("Please enter the ability value of player B: "))
    return a, b


# 模拟n场比赛
def sim_n_games(pow_a, pow_b):
    a_wins, b_wins = 0, 0
    while not race_over(a_wins, b_wins):
        a_score, b_score = sim_one_game(pow_a, pow_b)
        if a_score > b_score:
            a_wins += 1
        else:
            b_wins += 1
    return a_wins, b_wins


# 单局比赛结束
def game_over(a, b):
    if (a == 21 and b < 20) or (b == 21 and a < 20):
        return True
    elif 20 <= a < 30 and 20 <= b < 30 and abs(a-b) == 2:
        return True
    elif a == 30 or b == 30:
        return True


# 比赛结束
def race_over(a, b):
    return a == 2 or b == 2


# 模拟单局比赛
def sim_one_game(pow_a, pow_b):
    score_a, score_b = 0, 0
    serving = 'A'
    while not game_over(score_a, score_b):
        if serving == 'A':
            if random.random() < pow_a:
                score_a += 1
            else:
                score_b += 1
                serving = 'B'
        else:
            if random.random() < pow_b:
                score_b += 1
            else:
                score_a += 1
                serving = 'A'
    return score_a, score_b


# 输出结果
def print_summary(a_wins, b_wins):
    print(f"A : B --- {a_wins}:{b_wins}")
    if a_wins > b_wins:
        print("Player A took the lead in winning two games and won.")
    else:
        print("Player B took the lead in winning two games and won.")


def main():
    print_introduce()
    a_pow, b_pow = get_inputs()
    wins_a, wins_b = sim_n_games(a_pow, b_pow)
    print_summary(wins_a, wins_b)


main()