day10--作业

1、编写文件copy工具

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import os

def main():
    while 1:
        source_path = input('请输入要文件拷贝的源路径：').strip()
        if os.path.exists(source_path):
            obj_path = input('请输入文件拷贝的目的路径：').strip()
            f = open(source_path,encoding='utf-8',mode='r')
            f2 = open(obj_path, encoding='utf-8', mode='w')
            str = f.read()
            f2.write(str)
            f.close()
            f2.close()
            break
        else:
            print('输入的源地址文件不存在，请重新输入！')

if __name__ == '__main__':
    main()

2、编写登录程序，账号密码来自于文件

user_info = {}
count = 0
with open("/home/day10/user.db",mode="r",encoding="utf-8") as f:
    for line in f:
        user_name, passwd = line.strip().split(":")
        info[user_name] = passwd
while count<3:
    name = input("请输入你的用户名:").strip()
    pwd = input("请输入你的密码:").strip()
    if name in user_info.keys() and pwd == user_info.get(name):
        print("用户{}登录成功！".foramt(name))
        break
    else:
        count +=1
        print("用户名或者密码错误")
else:
    print("用户名或密码输错三次，退出")

 3、编写注册程序，账号密码来存入文件

user_info = {}
# 输入注册账号密码
name = input("输入账号名：").strip()
pwd = input("输入账号密码：").strip()
# 读取文件中已存在的账号密码信息
with open("/home/day10/user.db",mode="r",encoding="utf-8") as f:
    for line in f:
        user_name, passwd = line.strip().split(":")
        user_info[user_name] = passwd

# 判断用户名是否存在，存在就添加到文件中
if name in info:
    print("用户名已被使用")
else:
    _name = "%s:%s
"%(name,pwd)
    with open("/home/day10/user.db", "a", encoding="utf-8") as f:
        f.write(_name)
    print("注册成功。")