登陆三次验证（二）

usename = input('请输入你的注册账号')
passward = input('请输入你的注册密码')
with open('list_of_info',mode='w+',encoding="utf-8") as f:
    f.write("{}\n{}".format(usename,passward))
    print("恭喜你注册成功")
i=0
lis=[]
while i<3:
    usn = input('请输入你的登录账号')
    pwd = input('请输入你的登录密码')
    with open('list_of_info',mode='r+',encoding="utf-8") as f1:
        for line in f1:
            lis.append(line)
    if usn==lis[0].strip() and pwd ==lis[1].strip():
        print("恭喜你登陆成功")
        break
    else:
        print("对不起，你的号码密码错误")
    i+=1

注意：换行符\n