python实现猜字游戏

import random
x = random.randint(0,99)
while(True):
    num = input("please input a number\n")
    if(num.isdigit):
        num = int(num)
        if(x == num) :
            print("congratulations,you are winner!")
            break
        elif(x > num):
            print("you guess a little small!")
        elif (x < num):
            print("you guess a little big!")
    else :
        print("you input incorrect! please again!")