python猜数字游戏

from random import randint              #导入随即函数
def guessNum():                           #定义一个猜数字游戏函数，函数名为guessNum()
    guess=int(raw_input('a number for guess pls>'))   #用户输入任意一个数字
    key=randint(1,1000)          #获得一个随机数（即用户将要猜的那个数）
    #print key
    for x in range(9):
         #如果猜对了的话，输出u win并提示用户是否继续游戏，如果继续输入Y，否则输入N结束游戏
        if key==guess:                   
            print 'u win'
            is_continue = raw_input("Do you want to keep on the game?If Yes,input Y,else input N:")                  #用户输Y或N
            if(is_continue == 'Y'):   #当用户输入Y时，调用guessNum()函数，继续猜数字游戏
                guessNum()
            else:             #否则输出you had over the guessNum Game提示用户已经结束该游戏
                print 'you had over the guessNum Game'
           &