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('\n')
         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('\n').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 + '\n')
     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