蒙提霍尔问题

#coding: utf-8
import random       
num_loss = 0
num_win = 0
num = 0 
while True:
    door = [1,2,3] 
    luck_door = random.randint(1,3)
    while True:
        try:
            choose_door = int(raw_input(u'请输入你选择的门号（1,2,3）：'))
            if choose_door>0 and choose_door <=3:
                break
        except:
            print u'输入错误'            
    if choose_door == luck_door:
        door.remove(choose_door)
        remove_door = random.choice(door)                
        while True:
            sel = int(raw_input(str(remove_door)+ u'是错误的门，是否换至另一个门(1:是；2：否)：'))
            if sel == 1:
                print u"你输了..."
                num = num + 1
                num_loss = num_loss + 1
                break
            elif sel == 2:
                print u"你赢了！！！"
                num = num + 1
                num_win = num_win + 1
                break
            else:
                print u"输入错误，请重新输入"
    else:
        door.remove(choose_door)
        door.remove(luck_door)
        remove_door = random.choice(door)
        while True:
            sel = int(raw_input(str(remove_door)+ u'是错误的门，是否换至另一个门(1:是；2：否)：'))
            if sel == 2:
                print u"你输了..."
                num = num + 1
                num_loss = num_loss + 1
                break
            elif sel == 1:
                print u"你赢了！！！"
                num = num + 1
                num_win = num_win + 1
                break
            else:
                print u"输入错误，请重新输入"
    con = raw_input(u'本次游戏结束，按任意键继续，退出请按输入x')
    if con == 'x':
        print u'胜利次数',num_win,u'  失败次数：',num_loss,u'  胜率：',float(num_win)/num
        break