全球乒乓球总决赛

def printIntroduce():
    print(‘This program simulates a game between two players,A and B‘)
    print(‘Probability (a number between 0 and 1) is used!‘)

def getInputs():
    a=eval(input(‘What is the probability of player A wins?‘))
    b=eval(input(‘What is the probability of player B wins?‘))
    n=eval(input(‘How many games to simulate?‘))
    return a,b,n

def simulateNGames(n,probabilityA,probabilityB):#定义球员A，B赢得比赛的次数，初始值为0
    winsA=0
    winsB=0#通过for循环来模拟n场比赛
    for i in range(n):#simulateOneGame()用来模拟一场比赛#输入为球员的能力值,即每场比赛中每一回合获胜的可能性#返回的是本场比赛2个球员的得分#根据返回的得分来确定本场比赛的胜负
        scoreA,scoreB=simulateOneGame(probabilityA,probabilityB)
        if scoreA>scoreB:
            winsA+=1
        else:
            winsB+=1
    return winsA,winsB

def simulateOneGame(probabilityA,probabilityB):#每场比赛，2个球员的得分初始为
    scoreA=0
    scoreB=0
    f=0
    n=probabilityA+probabilityB
    A=probabilityA/n
    B=probabilityB/n
    while not((gameover1(scoreA,scoreB) and f==0)or(gameover2(scoreA,scoreB) and f==1)):
        if random()<A:
            scoreA+=1
        else:
            scoreB+=1
        if scoreA==scoreB==10:
            f=1
    return scoreA,scoreB

def gameover1(a,b):
    return a==11 or b==11

def gameover2(a,b):
    return math.fabs(a-b)==2

from random import *
import math
def main():
    printIntroduce()#打印程序的介绍信息
    probabilityA,probabilityB,n=getInputs()#通过simulateNGames()求得2个球员在n次比赛中获胜的次数
    winsA,winsB=simulateNGames(n,probabilityA,probabilityB)#通过printSummary()来输出比赛的结果信息
    printSummary(winsA,winsB)

def printSummary(winsA,winsB):
    n=winsA+winsB
    print(‘\nGames simulated:%d‘ % n)
    print(‘Wins for A:{0}({1:.1%})‘.format(winsA,winsA/n))
    print(‘Wins for B:{0}({1:0.1%})‘.format(winsB,winsB/n))