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#1、编写文件copy工具

oldpath=input('请输入源文件地址：')
newpath=input('请输入新文件存放地址： ')
with open(oldpath,mode='rt',encoding='utf-8')as file1,
    open(newpath,mode='wt',encoding='utf-8')as file2:
    res=file1.read()
    file2.write(res)
print('复制完成！')

#2、编写登录程序，账号密码来自于文件

with open('pwd.txt',mode='rt',encoding='utf-8')as file1:
    for i in file1:
        name,pwd=i.strip().split(':')
        if name==username and password==pwd:
            print('登录成功！')
            break
    else:
        print('登录失败！')

#3、编写注册程序，账号密码来存入文件

username=input('请输入你的账号：')
password=input('请输入你的密码： ')
with open('new_pwd.txt',mode='at+',encoding='utf-8') as file1:
    res=('{}:{}
'.format(username,password))
    file1.write(res)