python基础练习题08

import  datetime
today = datetime.date.today()
username = ‘kelly‘
password = ‘123456‘
num = 0

while num < 3:
    user = input(‘请输入用户名：‘)
    passw = input(‘请输入密码：‘)
    if username == user and password == passw:
        print(‘{},欢迎登陆，今天的日期是{},程序结束‘.format(username,today))
        break
    elif user == ‘‘ or passw == ‘‘:
        print(‘用户密码不能为空‘)
    else:
        print(‘用户名/密码输入错误‘)
    num += 1
else:
    print(‘失败次数过多‘)

import datetime
username = ‘kelly‘
password = ‘123456‘
today = datetime.date.today()
for i in range(3):
    user = input(‘请输入用户名:‘)
    passw = input(‘请输入密码‘)
    if user==‘‘ or passw==‘‘:
        print(‘用户名密码不能为空‘)
    elif user==username and passw==password:
        print(‘{},欢迎登陆，今天的日期是{},程序结束‘.format(username,today))
        break
    else:
        print(‘用户名密码输入错误‘)
else:
    print(‘输入次数过多‘)