3.13作业

1、编写文件copy工具：

with open('d.tet',mode='rt',encoding='utf-8') as f:
   f.read()

with open('a.tet', mode='wt', encoding='utf-8') as f:
   f.write()
2、编写登录程序，账号密码来自于文件：

 inp_name = input('请输入名字：').strip()
 inp_pass = input('请输入密码：').strip()
 for item in f:

        username,password = item.split(':')
        if inp_name == username and inp_pass == password:
            print('登陆成功')
            break
 else:
       print('登陆失败')

with open('d.tet',mode='rt',encoding='utf-8') as f:
     
3、编写注册程序，账号密码来存入文件：

 name = input('你的名字：').strip()
 pwd = input('你的密码：').strip()
 with open('d.txt',mode='at',encoding='utf-8') as f:
     f.write('{}:{}
'.format(name,pwd))