文件处理作业

#一：今日作业：
#1、编写文件copy工具
a = input('输入就文件名：')
b = input('输入新文件名：')
with open(r'{}'.format(a), mode='rt', encoding='UTF-8') as f, open(r'{}'.format(b),mode='wt',encoding='UTF-8') as l:
    res = f.read()
    l.write(res)
    
    
#2、编写登录程序，账号密码来自于文件
inp_name = input('输入账号：')
inp_paw = input('输入密码：')
with open(r'a.txt', mode='rt', encoding='utf-8') as f:
    for line in f:
        name,pwd = line.strip().split(':')
        if name == inp_name and pwd == inp_paw:
            print('登入成功')
            break
    else:
        print('登入失败')
        
        
#3、编写注册程序，账号密码来存入文件
inp_name = input('输入账号：')
inp_paw = input('输入密码：')
with open(r'a.txt', mode='rt',encoding='utf-8') as f:
    for line in f:
        name, pwd = line.strip().split(':')
        if name == inp_name:
            print('账号已存在')
            break
    else:
        with open(r'a.txt', mode='at', encoding='utf-8') as f:
            f.write('{}:{}
'.format(inp_name,inp_paw))
            print('注册成功')