python---简单的登录程序

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
import datetime
nowtime = datetime.date.today()
count = 0
while  count < 3:
    name =  input("请输入您的用户名：")
    pwd = input("请输入您的密码：")
    welcome  =  '欢迎%s登录，今天是%s'%(name,nowtime)
    count += 1
    if name == 'shasha' and pwd == '123456':
        print(welcome)
        break

    elif name.isspace()  or  pwd.isspace():
        print("用户名或密码不能为空！")
        continue
    elif name != 'shasha' or pwd != '123456':
        print("用户名或密码错误！")
        continue
else:
    print("出错次数太多")