#以下代码适用于作者本机，使用前请先测试

import os 
username1 = 'caixiao1' 
password1 = 'abc123' 
count = 0  
while count<3:     
    black_usr = open('F:\\python文件\\username_.txt','r')     
    black_usr_t = black_usr.read()     
    black_usr_s = black_usr_t.strip().split()     
    _username = input("username: ")     
    _password = input("password: ")     
    if _username in black_usr_s:         
       print("账户被锁定")         
       black_usr.close()         
       break      
    username = open('F:\\python文件\\username_.txt', 'a')     
    password = open('F:\\python文件\\password_.txt', 'a')     
    count = count +1      
    if _username == username1 and _password == password1:         
        print("亲，欢迎进入")         
        break     
    elif _username != username:         
        print("亲,用户名不存在")         
        username.write(_username + '\n')         
        password.write(_password + '\n')        
        username.close()         
        password.close()     
    elif _password != password:         
        print("亲，密码错误")         
        username.write(_username + '\n')         
        password.write(_password + '\n')         
        username.close()         
        password.close()
else:     
    print(count)     
    print("你输入的次数超过三次")

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