作业2

def printIntro():
print("这个程序模拟两个选手A和B的乒乓球比赛")
print("程序运行需要A和B的能力值（以0到1之间的小数表示）")

#获得程序运行参数
def printInputs():
a = eval(input("请输入选手A的能力值(0-1): "))
b = eval(input("请输入选手B的能力值(0-1): "))
n = eval(input("模拟比赛的场次: "))
return a, b, n

# 进行N场比赛
def simNGames(n, probA, probB):
winsA, winsB = 0, 0
for i in range(n):
for j in range(7): #进行7局4胜的比赛
scoreA, scoreB = simOneGame(probA, probB)
if scoreA > scoreB:
winsA += 1
else:
winsB += 1
return winsA,winsB


#进行一场比赛
def simOneGame(probA, probB):
scoreA, scoreB = 0, 0 #初始化AB的得分
serving = "A"
while not gameOver(scoreA, scoreB): #用while循环来执行比赛
if scoreA==10 and scoreB==10:
return(simOneGame2(probA,probB))
if serving == "A":
if random() < probA: ##用随机数生成胜负
scoreA += 1
else:
serving="B"
else:
if random() < probB:
scoreB += 1
else:
serving="A"
return scoreA, scoreB

def simOneGame2(probA,probB):
scoreA,scoreB=10,10
serving = "A"
while not gameOver2(scoreA, scoreB):
if serving == "A":
if random() < probA:
scoreA += 1
else:
serving="B"
else:
if random() < probB:
scoreB += 1
else:
serving="A"
return scoreA, scoreB

#比赛结束
def gameOver(a,b): #正常比赛结束
return a==11 or b==11
def gameOver2(a,b): #进行抢12比赛结束
if abs((a-b))>=2:
return a,b


#输出数据
def printSummary(winsA, winsB):
n = winsA + winsB
print("竞技分析开始，共模拟{}场比赛".format(n))
print("选手A获胜{}场比赛，占比{:0.1%}".format(winsA, winsA/n))
print("选手B获胜{}场比赛，占比{:0.1%}".format(winsB, winsB/n))

#主体函数
def main():
printIntro()
probA, probB, n = printInputs()
winsA, winsB = simNGames(n, probA, probB)
printSummary(winsA, winsB)

main()