python——学习登录用户和密码的判断——1

user_pwd.txt的文件内容是 wangwei 123
lock.txt的内容为空


import sys,getpass,os
count =0
print ("小伙子，欢迎来到坑比联盟，下面开始登陆你的账号。")
username = input("请输入用户名：")
lock_file = open('lock.txt', 'r+')
lock_list = lock_file.readlines()
for lock_info in lock_list:
    lock = lock_info.split()
    if username in lock:
        sys.exit('您已被锁定...请联系管理员')
user_file = open('user_pwd.txt', 'r+')
user_list = user_file.readlines()
for user_info in user_list:
    user = user_info.split()
    if username in user:
            while count < 3:
                password = input("请输入密码：")
                if password == user[1]:
                    print("登陆成功！")
                    break
                else:
                    count +=1
                    print("密码错误，你还有{0}次机会".format(count))
            else:
                lock_file.write(username +'\n' )
                sys.exit('密码输错3次,该用户已被绑定')
    else:
        sys.exit('用户不存在')
user_file.close()
lock_file.close()