Python基础-用户验证

一、项目需求

　　1、根据用户名和密码，验证用户是否可登陆

　　2、允许一次执行可验证三次

　　3、当用户名输错三次后，该用户名锁定，永久不可登陆

二、代码如下

　　

 #!/usr/bin/env python
 #-*- coding:utf-8 -*-
 #import operator
 n = 0
 username="user123"
 password="123.abc"
 count_dict={}
 tmp_dict={}
 with open("lock",mode="r+",encoding="utf8") as f_read,open("lock_tmp",mode="a+",encoding="utf8") as f_write:
 #lock文件和lock_tmp要先创建
     while n<3:
         name=input("please input username:").strip()
         pwd=input("please input passwd:").strip()
         for line in f_read:
             if name in line:
                 print("当前用户已经被锁定，请联系管理员！！")
                 exit()
         if name == username and pwd == password:
             print("欢迎%s登录"%username)
             exit()
         else:
             print("用户名或密码错误，请重新输入！")
             f_write.write(name+"\n")
             if name not in tmp_dict:
                 tmp_dict[name]=1
             else:
                 tmp_dict[name]+=1
         n+=1
     # print(tmp_dict)
     for line in f_write.readline():
         line = line.strip()
         count = count_dict.setdefault(line,0)
         count+=1
         count_dict[line]=count
     print(count_dict)
     f_write.seek(0)
     for k in count_dict.keys():
         print(k,count_dict[k])
         # print(count_dict[k])
         if count_dict[k] >= 3:
             f_read.write(k+"\n")
     for k1 in tmp_dict.keys():
         if tmp_dict[k1]>=3:
             f_read.write(k1+"\n")