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# -*- coding=utf-8 -*- user = {'alex':'qwer1234','lilei':'asdf1234','han×××':'zxcv1234','lucy':'qwer1234'} loop = True while loop: count = 0 f = open('blacklist.txt', mode='r', encoding='utf-8') blacklist = f.read() f.close() input_user = input('please input your username:').strip() if not input_user : continue if input_user in blacklist: print('sorry,your username is banned') continue for i in user: input_pw = input('please input your password:').strip() if input_user not in user: print('sorry,your username is error') elif user[input_user] == input_pw: print('wellcome',input_user) loop = False break else: count += 1 print('sorry,your password is error,you have %s times'%(3-count)) if count > 2: f = open('blacklist.txt','a',encoding='utf-8') f.write('%s '%input_user ) print('sorry,your username is banned') f.close() break