Python作业模拟登陆(第一周)

模拟登陆：
1. 用户输入帐号密码进行登陆
2. 用户信息保存在文件内
3. 用户密码输入错误三次后锁定用户

思路：

1. 用户名密码文件为passwd,锁定用户文件为lock

2. 用户输入账号密码采用input输入，分割passwd文件出user,passwd字段并比较input的user和passwd

3.当用户三次输入错误后将input user写入到lock文件，读取时判断是否在lock文件中存在

流程图：

代码展示（Python 3.6）:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author: Colin Yao
"""模拟登陆作业"""
import time,sys,getpass
print("Welcome Please input your username and shopping_db ")
account_file = 'passwd'
lock_file = 'lock'
count = 0

while count <3:
    username = input("username : ")
    password = input("Passwd : ")
    #password = None
    #password = getpass.getpass("Passwd : ") #可以使用密文或者明文
    lock_f = open("lock", "r+")
    lock_userlist = lock_f.readlines()

    for lock_user in lock_userlist:
        lock_user = lock_user.strip('
')
        if username == lock_user:
            print("%s is lockd 30s  later this program  will end " % lock_user)
            time.sleep(30)
            sys.exit()

    with open("passwd", "r") as f:
        userlist = f.readlines()
        for user_line in userlist:
            (user, passwd) = user_line.strip('
').split()
            if username == user:
                if password == passwd:
                    print('welcome %s ' % username)
                    sys.exit(0)
                elif password == None:
                        print("not allow none")
            else:
                pass
        else:
            print("sorry username or shopping_db wrong try again" )
        count += 1

else:
    lock_f.write(username + '
')
    sys.exit("please restart and user:%s is locked " %username)
lock_f.close()

passwd文件内容

colin 123456
python 123456
golang 123456

lock文件内容

colin1
colin2