day3-python 登录

 import datetime
 # 1、
 f = open('users')
 result = f.read()
 f.close()
 user_list = result.split()  #
 user_dic = {}
 for user in user_list:
     username,password = user.split(',')
     user_dic[username] = password for i in range(3):
     username = input('请输入用户名：').strip()
     # password = getpass.getpass('请输入密码：').strip()
     password = input('请输入密码：').strip()
     if username == '' or password == '':
         print('账号/密码不能为空')
     elif username not in user_dic:
         print('用户名不存在')
     elif password == user_dic.get(username):
         print('%s欢迎登陆，今天的日期是%s'%(username,datetime.datetime.today()))
         break
     else:
         print('账号/密码错误！')
 else:
     print('错误次数过多！')