Python通过简单的文件读写，来实现注册登录

# -*- coding:utf-8 -*-
''''''
username = input('请输入您的姓名：')
password = input('请输入密码：')
with open('get_info.txt','w+',encoding='utf-8') as file:
    file.write('{}\n{}'.format(username,password))
　　 #file.write('%s\n%s'%(username,password))  用着行代码就可以不用使用format函数，效果是一样的

    print('注册成功！\n开始登录')

i = 0
lis = []
while i<3:
    usn = input('请输入您的姓名：')
    pwd = input('请输入密码：')
    with open('get_info.txt','r+',encoding='utf-8') as f:
        for line in f:
            lis.append(line)
        if usn == lis[0].strip() and pwd == lis[1].strip():#strip函数，用于消除空格和换行符
            print('登录成功！')
            break
        else:
            print('账号或者密码错误')


    i+=1